Desert Botanical Garden Core Trail Master Plan by Desert Botanical Garden

Core Trail Master Plan

October 2011

TABLE OF CONTENTS

LETTER FROM THE DIRECTOR CHAPTER 1: INTRODUCTION

Guiding Philosophies Mission Vision Core Values

CHAPTER 2: OVERARCHING PLANNING CONCEPTS Philosophical Framework

Relationship with Site-Wide Master Plan Identity Areas Circulation Pedestrian Orientation Prospects, Pull-Offs, and Tribute Gardens

CHAPTER 3: THE PLANNING VISION

Relationship with Future Garden Expansion Desert Vestibule Desert Portal Arroyo Prospect Chiaroscuro Trellis Stardust Plaza The Grove Moonlight Basin Sibyl B. Harrington Cactus and Succulent Galleries Deserts of the World Berlin Agave Yucca Forest Childrenâ&#x20AC;&#x2122;s Garden Maze Arroyo Gallery Arroyo Crossings Flowering Wash Eastern Plaza and Wildlife Gallery Eastern Plaza Wildlife Gallery Arroyo Overlook Wesbster Vestibule 2

9 9 9 9

12 12 12 13 15 16

20 21 21 22 22 24 24 24 25 26

Heritage Gallery Founders Garden Stewards Wall Cardon Plaza Center for Desert Living Trail Desert Palm Oasis Gallery Painted Desert Paseo Opuntia Prospect Wash Walk

CHAPTER 4: REALIZING THE MASTER PLAN

Project Clusters and Sequencing Future Considerations Additional Resources

ACKNOWLEDGMENTS

Financial Support Planning Participants Design Team

LIST OF ILLUSTRATIONS

27 28 28

32 32 36 36 37

Philosophical Framework following page 12 Relationship with Site-Wide Master Plan following page 12 Identity Areas following page 12 Circulation following page 14 Prospects, Pull-Offs and Tribute Gardens Diagram following page 16 Overall Master Plan following page 20 Detail Areas Northern Core Trail following page 22 Desert Vestibule and Portal: following page 22 Conceptual Choreography Planted Canyon Concept Conceptual Section Elevation Central Core Trail following page 24 Southwest Core Trail following page 28 Painted Desert Paseo following page 28 Project Clusters and Sequencing following page 32

LETTER FROM THE EXECUTIVE DIRECTOR

s its very name suggests, the Core Trail is the heart of the Desert Botanical Garden.

In one form or another, it has been delighting Garden visitors for nearly 75 years. The following plan was developed to celebrate the historic character of the Core Trail by paying tribute to the legacy it represents. At the same time, the plan also calls for renovation of portions of the trail in order to maximize its beauty through the use of contemporary design principles. I am so very pleased with the delicate balance between historic and contemporary that was achieved by all those who participated in the Core Trail master planning process And I am equally proud to share with you in the pages that follow the plan that will guide our growth as we launch into the next 75 years of the Desert Botanical Gardenâ&#x20AC;&#x2122;s history.

Kenneth J. Schutz The Dr. William Huizingh Executive Director

CHAPTER 1: INTRODUCTION

The Core Trail Master Plan emphasizes the Trail’s role as the core of the Garden’s experience, brand, and message. It presents the Garden’s identity, mission, values, messages, and collections in an engaging and beautiful manner. The proposed enhancements augment the Trail’s role as a vibrant synopsis of all the Garden is and does - attracting, delighting, and inspiring visitors throughout the year. Strengthened spatial choreography establishes an immersive experience weaving together beauty, horticulture, learning, research, and amenities. The Plan stages theatrical moments within a calming naturalistic landscape while enhancing existing views, spatial structure, collections, and landforms. It also increases the contrast of areas of sun/openness; shade/enclosure, and dry/moisture to diversify the range of aesthetic expression, botanical compositions, and research opportunities. �� and staff amenities and conveniences one expects from a world-class destination. The renewed Core Trail showcases a full palette of desert plants from around the world composed into beautiful and meaningful compositions. Stages for spectacular changing horticultural displays create ways to draw visitation and celebrate the desert’s seasons. New galleries, displays, and collections present plants, human culture and ecosystems in creatively unexpected ways so people are able to encounter and perceive them deeply. In short, the Core Trail Master Plan celebrates the Desert Botanical Garden’s legacy of outstanding exhibition, education, research, and conservation in a setting like no other in the world.

Guiding Philosophies

The Desert Botanical Garden has a culture of ongoing, collaborative, and inclusive planning. This tradition grounds the planning process in several key statements embodying the organization’s ethos and values. The Garden’s Mission, Vision, and Core V�� future.

Mission The Desert Botanical Garden’s commitment to the community is to advance excellence in education, research and the exhibition and conservation of desert plants of the world with emphasis on the Southwestern United States. We will ensure that the Garden is always a compelling attraction that brings to life the many wonders of the desert.

Vision

The Garden’s vision is to be the premier center in the world for display, study and understanding of desert plants and their environments. The Garden strives to be an indispensable resource in the Southwestern United States for helping individuals learn about Sonoran Desert plants as well as des�� the visitor experience into one of discovery and meaning about deserts and desert plants.

Core Values Stewardship: Interdependence: Authenticity: Accountability:

To protect and preserve desert plants, animals and habitats To respect the mutual destinies that link people, plants and all of nature T�� To act ethically and responsibly as we serve our many communities

CHAPTER 2: OVERARCHING PLANNING CONCEPTS

Philosophical Framework Three conceptual gradients emerge from existing forms, patterns, aesthetics, and land uses. The Core T�� tanical Garden’s vibrant legacy (see Philosophical Framework diagram following page 12). A central north-south gradient begins with contemporary expression on the north (e.g. Ottosen Entry Garden, proposed Desert Vestibule) and blends into tradition/history at the south (e.g. Webster Center, proposed Heritage Gallery). A central west-east gradient transitions from the sweeping scale and bold minimalism of the natural desert landscape, to artistic garden abstraction (e.g. existing and proposed Core Garden Trail galleries), to educational/programmatic spaces at the east (e.g. Marley Education and Volunteer Building, future Children’s Garden). A meandering central west-east spatial experience celebrates the arroyo wash topography, microclimate, and hydrology. It has the potential to become the verdant heart of the Core Trail and the whole Garden.

Relationship with Site-Wide Master Plan The planning process is an evolution of the 20 Year Physical Master Plan (published March 5, 2008) by Spurlock Poirier Landscape Architects. The Core Trail Master Plan focuses on the core garden, but also considers connections with possible future destinations and features within the property east and west of the Core Trail in the 20 Year Physical Master Plan (see Relationship with Site-Wide Master Plan diagram following page 12).

Identity Areas Identity Areas are a means of perceiving the Core Garden through a comprehensive perspective. The Identity Areas strengthen contrast and diversity, providing a tool for understanding and communicating the Garden’s distinctive parts as well as the integrated whole. The majority of the areas are synonymous with the Garden’s concept of a “gallery” (see Identity Areas diagram following page 12). Identity Areas delineate zones of strongly related character, aesthetics, functions, purposes, plant collections, visitor experience, interpretive themes, and history. Adjacencies and relationships among various �� .

Future/ Contemporary

Landscape-Scale/ Sublime/ Experimental

Garden-Scale/ Beautiful/ Educational

CORE

Heritage/ Traditional

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Core Trail: Philosophical Framework

Harriet K. Maxwell Wildflower LoopTrail

Ottosen Entry Garden

CORE TRAIL

The Painted Desert Paseo Possible Landform Landscape

Desert Vestibule

Sibyl B. Harrington Cactus + Succulent Gallery

Cactus + Succulent Gallery

Possible Dune Landscape Desert Portal

Stardust Plaza Childrenâ&#x20AC;&#x2122;s Garden Maze

Deserts Of The World

West Campus Future Projects

Eastern Plaza Arroyo Gallery

Future Childrenâ&#x20AC;&#x2122;s Garden

Wildlife Gallery Possible Exhibition Gardens

Heritage Gallery Center for Desert Living

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Sonoran Desert Nature Loop Trail

Plants and People of The Sonoran Desert Loop Trail

Core Trail: Relationship with Site-Wide Master Plan

The Painted Desert Paseo

Desert Vestibule

Desert Palm Oasis Gallery

Cactus + Succulent Gallery

Desert Portal

Stardust Plaza

Cactus + Succulent Gallery Childrenâ&#x20AC;&#x2122;s Garden Maze

Deserts Of The World

Eastern Plaza Arroyo Gallery Wildlife Gallery

HeritageGallery Arroyo Gallery

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Core Trail: Identity Areas

Identity Areas provide a framework for future planning and design, particularly in terms of visitor �� The Core Trail Master Plan delineates fourteen Identity Areas forming the skeleton of the site-wide framework, including the: 1. Desert Vestibule (Proposed) 2. Desert Portal (Proposed) 3. Deserts of the World (Expansion and Enhancement of Existing) 4. Sibyl B. Harrington Cactus and Succulent Gallery (Existing) 5. Stardust Plaza (Proposed Enhancements to Existing) 6. Children’s Garden Maze (Proposed) 7. Center for Desert Living (Existing) 8. Wildlife Gallery (Proposed Enhancements to Existing) 9. Arroyo Gallery 10.Heritage Gallery (Expansion and Enhancement of Existing) 11.Painted Desert Paseo (Proposed) Views and vistas as well as circulation patterns link the Identity Areas into an integrated experience.

Circulation A major component of the Core Trail Master Plan involves clarifying and enhancing pathways to assist �� The existing layout contains intriguing paths linking sequences of various garden galleries, collection plantings, and features. However current visitors tend �� The Master Plan outlines a strategy for respecting the existing trails while simultaneously accommodating the way current visitors navigate and discover outdoor spaces (see Circulation diagram following page 14).The approach includes: �� • Considering deletion of redundant or confusing paths; • Adding new paths with alignments sympathetic to existing ones; and �� intersections to assist in orienting visitors.

CHAPTER 2: OVERARCHING PLANNING CONCEPTS

The Core Trail Master Plan organizes visitor circulation into a series of nested and interconnected loops within the Identity Areas. Pathways have three levels of relative emphasis and support how visitors experience the gardens. The hierarchy also responds to how people encounter the Garden: • �� of the Garden’s mission, identity, and purpose; • The Secondary pathways encourage people with more time to develop deeper understand- ings of the Garden’s many messages, collections, activities, and operations; and • The Tertiary routes encourage casual lingering and discovery for repeat visitors and visitors with additional time to spend. Ideally, path widths, materials, and alignments provide intuitive cues about orientation and directionality. Primary Paths lead visitors from the Ottosen Entry Garden through the proposed Desert Vestibule and into the proposed Desert Portal, the Core Garden’s Central hub. Three primary paths launch from the Portal: • The Core Trail leading east into Deserts of the World and East Campus; • The Core Trail leading south into the Heritage Gallery; and • The Opuntia Walk leading to the proposed future West Campus expansion. These are the widest walks (8’ minimum) and are paved with all weather ADA compliant (Americans with Disabilities Act) surfaces. Secondary Paths invite visitors deeper into the galleries and trails, encouraging people to spend additional time in the Garden. A richer immersive experience and relationship with the Garden follows. �� short stay. The width is generous (6’ minimum), but distinctly narrower than the primary paths. Most, if not all, of the secondary routes are paved with an ADA compliant surface clearly different in appearance than the primary routes. Major secondary routes: �� Trail; • Draw visitors from the Core Trail into the Sibyl B. Harrington Cactus and Succulent Galleries; and • Link the east and west ends of the Arroyo Gallery with the Core Trail. Secondary routes also include paths leading off the Core Trail. These routes include the thematic loop trails launching from the Core Trail. • Plants and People of the Sonoran Desert Loop Trail • Sonoran Desert Nature Loop Trail • �� Trail • Path to Webster House and the Ullman Terrace • Center for Desert Living Trail.

LEGEND Nodes Core Primary Secondary Tertiary Circulation Paths Primary Secondary Tertiary

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Core Trail: Circulation

Tertiary Paths, are the narrowest widths (4’) and are ADA accessible, but have a more naturalistic appearance than primary and secondary paths. Service Roads occur on the pedestrian routes throughout most of the Core Trail. Space, unfortunately, does not permit a separate system of maintenance paths. Designing service routes is a priority as the Garden develops plans and designs for the Western and Eastern Campuses.

Pedestrian Orientation The Core Trail Plan suggests building upon the four levels of orientation the Garden has started integrating within the circulation system hierarchy and supports the 20 Year Physical Master Plan. Information appears at locations where visitors encounter thresholds between Garden areas, generally at the primary, secondary, and tertiary nodes within the circulations system (see Circulation diagram following page 14). Since nodes are places where visitors intuitively hesitate or stop, they are ideal locations to create amenity clusters. These are aggregations of creature comforts such as drinking fountains, signage, interpretation, and shaded seating. The Garden might stage events and programs in the larger nodes (e.g. the Desert Portal and Eastern Plaza) so they also offer power, potable water, and other utilities. Primary Orientation focuses on the overall Desert Botanical Garden, its mission, overall purpose for being, amenities, and physical layout. Messages occur at the Visitor Center/Ticketing/Gift Shop/Café. Secondary Orientation describes the Core Desert Trail/Core Garden’s galleries, interpretive themes, and amenities. Messages occur at the north entry to the Desert Vestibule, the Desert Portal, and possibly the Eastern Plaza. Tertiary Orientation�� Messages occur at the intersection of the Core Trail with the Loop Trails and where future trails launch from the Conservatory.

CHAPTER 2: OVERARCHING PLANNING CONCEPTS

Prospects, Pull-Offs, and Tribute Gardens Several landscape elements add greatly to the spatial experience and distinct character of the Core Trail (see Prospects, Pull-Offs, and Tribute Gardens diagram following page 16). One of the most memorable, the tribute gardens, is an essential part of the Garden’s unique sense of place.

Prospects Prospects are views of attractive landscape scenes and compositions, particularly panoramas including distant features. The compelling power of the Garden’s spaces rests on an artfully choreographed interplay of open and enclosed spaces related to dynamic plays of light and shade. Skillfully staged views are an essential component of the galleries, garden rooms, the relationships among them, and their relationships with the landscapes surrounding the Garden. There are two types of views, internal and external (see Prospects, Pull-Offs, and Tribute Gardens diagram following page 16). Internal Views occur within the Garden and assist in leading visitors through the spaces by framing sightlines to sculptural plantings, iconic destinations, and other features. Indeed, views are an essential �� The Core Trail path’s alignment follows the top of the arroyo’s northern and southern sloping banks. The elevated position permits a cinematic sequence of views into and across the low-lying wash. Internal Views rely heavily on carefully layered relationships among: • Foreground human-scale detail and intimacy, particularly small plants and special specimens; • Mid-ground framing, including dense massing, silhouetted specimens, and diaphanous veils of foliage; and • Background architectural focal points, glimpses to the Core Trail on the arroyo’s opposite side, and deep views of the buttes and sky. The Garden is able to manage internal views with a great degree of accuracy because of its location in Papago Park. The basis of stewardship activities includes maintaining and enhancing the power and function of these views, particularly when planning and designing new projects.

The Core Trail’s raised elevation offers the perfect stage from which to gaze upon External Views �� sky. Borrowed views are critical to the Garden’s sense of place and regional expression. External views rely heavily on relationships among: • Foreground framing and location of the viewer, usually from a position offering some sense of enclosure; • Depth of view into the distance; and • Dramatic scale and rugged beauty of landscape and sky in the distance.

LEGEND

Prospects

Pull-off Areas

New Tribute Gardens

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Core Trail: Prospects, Pull-Offs, and Tribute Gardens

Existing Vegetation�� s stewardship. Some have grown too exuberantly, obscuring the Core Trail’s many internal and external prospects. Ongoing horticultural maintenance has the potential to sculpt some views in the short term. However, future planning and design efforts are necessary to identify, coordinate, and realize the property’s full visual potential.

Pull-Offs A series of small gathering areas form “buds” off primary and secondary paths within the Core Trail. �� pedestrians to bypass staff vehicles. Larger pull-offs are possible locations for amenity clusters (e.g. drinking fountains, interpretation).

Tribute Gardens The existing tribute gardens within the Core Trail perform several important functions, including: • Honoring people who have cherished the Garden; • Offering intimate oases where visitors may rest; and • Drawing people into large areas of planting. Visitors discover these human-scaled retreats at delightfully unexpected moments. Water features, detailed planting, and stonework accent these refreshing spots. The Core Trail Master Plan proposes additional locations to continue this tradition of celebrating supporters in a living manner while augmenting the visitor experience. Design for new tribute gardens: • Occupy an approximately 20’ diameter circular or elliptical area; • Showcase the sound and motion of a small-scaled water feature; and �� conversation.

CHAPTER 3: THE PLANNING VISION

The overarching goal is to create an evolving outline for the Core Trail’s future. Planning and design respect the Desert Botanical Garden’s existing atmosphere, cultural heritage, identity, functions, and ecological health while inserting new galleries, learning opportunities, landscape features, enhanced circulation, and visitor interaction. Planning builds upon, connects, and enhances existing elements, into a holistic experience.

Relationship with Future Garden Expansion The Core Trail Master Plan speculates on features the Garden might consider developing to the Core Trail’s east and west, if only to consider holistically: • Visitor destinations and amenities; • Ways to attract people into currently under-visited Garden areas; �� • Venues for programs, events, and on-site revenue generation; • Displays, exhibits, and collections; and • Views. As outlined in the 20 Year Physical Master Plan, suggestions for the Eastern Campus include the Children’s Garden and Teaching Greenhouses (see Relationship with Site-Wide Master Plan diagram following page 12). The Western Campus is the proposed site for several possible major visitor destinations, including: • The Opuntia Garden; • The Desert Palm Oasis Gallery; • A year-round Conservatory exhibit and event space; and • The Desert Garden Festival presenting temporary exhibition show gardens by national and international designers. The Western Campus also potentially contains two possible landscape-scale art gardens abstracting, for example, two ideas emerging from the planning process: • The sculptural landforms of the desert, particularly Papago Butte in the distance; and • The shifting sands and patterns of desert dunes.

Sybil B. Harrington Cactus and Succulent Gallery Stardust Plaza Deserts of the World Berlin Agave Yucca Forest Childrenâ&#x20AC;&#x2122;s Garden Maze

Painted Desert Paseo Desert Vestibule Desert Portal

Wildlife Gallery Arroyo Gallery Heritage Gallery Desert Palm Oasis Gallery

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Core Trail: Master Plan

Desert Vestibule The gently sinuous gallery irresistibly draws visitors from the Ottosen Entry Garden southward into the Core Desert Trail (see Northern Core Trail plan following page 22). The Vestibule’s alignment seduces without directly revealing its destination until people discover the sudden openness and panoramic views of the Desert Vestibule. The curvilinear form is a distinct contrast to Ottosen’s rectilinear geometry. The overall effect is of continuity married with compelling variation. A key criterion for future design is the Vestibule’s relationship with the Sibyl B. Harrington Cactus and Succulent Gallery to the east and views of Papago Butte to the west. Plantings focus on the stunning range of desert plants from around the world and their most striking aesthetic characteristics. The planting design is intentionally bold, gestural, and “alien” in contrast with the relative gardenesque lushness of Ottosen. The majority of tiered planters contain permanent plantings distinct to the Garden’s collections, especially repetition of key signature species (e.g. Boojum and Agave). However, certain planters are ideal locations for rotating displays of diminutive or rare and endangered species; others are stages for majestic sweeps of seasonal color. Potential materials continue the Garden’s existing vocabulary of stone, steel, and concrete. Discrete lighting illuminates the “canyon” at night with an enchanting glow. Permanent concrete or stone pads amongst the planting encourage installation of temporary exhibits. The Vestibule thus becomes an introductory gallery preparing visitors for the Core Trail. Irrigation is innovative and partially expressed.

Desert Portal Visitors emerge from the inward-directed enclosure of the Desert Vestibule and emerge suddenly into the wide-open space of the Desert Portal (see Northern Core Trail plan following page 22). This 50’ diameter plaza is the central hub of the Core Trail, both the existing Trail portions to the east and the proposed Trail expansion in the Garden’s Western Campus. The Portal’�� to meet current and anticipated visitation. Three primary paths emerge from the Desert Portal. The western one winds to the Western Campus via the Opuntia Walk. The southern path connects with the existing Agave Bridge leading to the Center for Desert Living Trail and the Webster Center. The eastern path enters the Deserts of the World Gallery, Sibyl B. Harrington Cactus and Succulent Galleries, and the Garden’s Eastern Campus. The Desert Vestibule path, as discussed, connects from the north. Open “slices” in the tiered planters create de�� The metal or stone side walls are ideal locations for graphics, directional signage, and lighting. The Portal is a key location for orienting people to the entire Core Trail experience. It offers drinking fountains, shaded seating, interpretation, and gathering space. This central location has the potential to be a venue for docent stations, programs, and revenue-generating events. An enclosed space beneath one of the taller planters provides secure storage.

CHAPTER 3: THE PLANNING VISION

T�� s northwest and northeast quadrants, creating an amphitheater-like backdrop and directing views west to Papago Butte, southeast into the arroyo, and southeast to the Garden Butte. This framing device dramatically accentuates visitors’�� The spatial sequence is similar to passing through the admissions booth and encountering the horizontal panoramas of Ottosen and Papago Butte to the west. The southeast quadrant’s Floating Garden is at the same grade as the remainder of the plaza, but it is higher than the adjacent wash. The effect creates a planted balcony showcasing “roof garden” adapted plants and offering tempting vistas into the future Arroyo Gallery. A water feature adds sound and respite from the heat. Soft illumination at night emphasizes the sense of the plaza as a hovering platform. The Chiaroscuro Trellis�� s southeast quadrant. Metal posts are as slight as possible or clustered to dematerialize any connection to the ground. Its design casts ever-changing patterns of shade and sun on the screen of the concrete plaza. The height is suf�� The central location makes the trellis an iconic piece of sculpture and landmark in the Garden’�� new aspects of the Trellis and scatters patterns on the paving. Plantings continue those of the Desert Vestibule, but intensify the presence of signature species, especially the Boojum. Materials continue those of the Desert Vestibule. Interpretative signs orient visitors to the Core Trail and prepare them to optimize their time in the Garden. A�� Permanent concrete or stone pads showcase sculpture exhibits.

Stardust Plaza A series of enhancements has the potential to create a true visitor destination between the Sibyl B. Harrington Cactus and Succulent Gallery pavilions. The Plaza is a place for social networking and a venue for performances and events, the Garden’s version of Paris’ Luxembourg Gardens (see Northern Core Trail plan following page 22). It has the potential to become a meditative retreat during the day and a chic, urbane outdoor living room at night. The Grove of canopy trees forms a verdant ceiling at the height of the iconic pavilions, marrying the eastern and western structures with welcome shade. The trunks play a visual rhythm across the pavement and subtly delineate smaller areas within the larger Plaza. Ideally, the trees have interest through�� , fragrance, foliage, and bark.

Opuntia Prospect Desert Vestibule Tiered Planters Storage Pedestrian Access Storage/ Concessions Accent Paving The Grove Moonlight Basin Naturalistic Desert Plantings/ Collections New Path Alignment Arroyo Prospect Arroyo Crossing Arroyo Terrace/ Seat Wall

New Tribute Garden

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Desert Portal Plaza

Floating Garden

New Bridge

Chiaroscuro Trellis

Core Trail: Northern Core Trail

Immersion and New Perspectives

Small-Scale Changing Displays

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Thresholds and Portals

Mulit-Purpose Gathering Space and Amenities

Desert Vestibule and Portal: Conceptual Choreography

Vertical Iconic Species Plants with Appealing Undersides

Ornamental Tree “Scrim”

Plants with Strong Silhouettes

Cascading Plants “Jewel Case” Gardens

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Eye Level Plants Seating and Display Ledges Illuminated Stone “Buttresses”

Desert Vestibule and Portal: Conceptual Section Elevation

Chiarascuro Trellis

Vertical Iconic Plant Species

Diverse Plants from Deserts Around the World

Tiered Planters

“Jewel Case” Gardens “Buttresses” of Desert Stone

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Desert Vestibule and Portal: Planted Canyon Concept

A shallow course of water, the Moonlight Basin, ripples diagonally across the center of the space, sparkling with light and bubbling with sound. Small jets emerge from the pebbles in sequenced patterns. The Basin’s bed is of ADA accessible mortared pebbles set in artistic patterns. A�� as it is wet. The Core T�� strengthen the rectilinear shape. Bands of stone paving (running east-west) bridge the slightly depressed Basin and accentuate the Plaza’s compacted gravel paving (stabilized to decrease dust). The shade trees weave playfully across the rectilinear pattern. A small structure on the northern edge contains storage, water feature equipment, and possibly serves as a concession stand. Evergreen desert shrubs enclose the Plaza – densely on the north side and diffusely on the south. Accent plantings along the perimeter focus on color and fragrance peaking in the evening. Moveable tables and chairs encourage people to linger. A discrete pedestrian path leaves the northeast corner to reach the SRP Visitor Center and Boppart Courtyard. A short walk connects the southwestern corner with the Core Trail via the Deserts of the World Gallery. The Plaza offers other amenities including drinking fountain, potable water, Wi-Fi, irrigation, power for events, and possibly a sound system. Dramatic lighting celebrates the beauty of the desert at night.

Sibyl B. Harrington Cactus and Succulent Galleries Plans call for the perpetual renewal of the current design intent and its iconic structures.

CHAPTER 3: THE PLANNING VISION

Deserts of the World This area is an expansion and enhancement of the existing naturalistic plantings rather than an intensely designed gallery per se. The vegetation is a palate cleanser between the Desert Portal and the Sybil B. Harrington Cactus and Succulent Gallery (see Central Core Trail plan following page 24). A water feature abstracting a desert seep emerges from the southern end of Stardust Plaza’s Moonlight Basin. Water trickles down the existing swale and generates a lush microclimate. A possible Tribute Garden overlooking the Arroyo Gallery sits across the Core Trail path from the seep. Ornamental trees link the two. Plantings add to the existing collections and emphasize the diversity and beauty of desert vegetation. Future planning and design retain and showcase the existing mature and iconic specimens. Adjustments move the Core Trail path southward to create additional garden space and to engage the Arroyo Gallery with a pull-off overlooking the future Arroyo Gallery’s elevated bridges and plantings. Interpretative themes possibly include the story of the world’s deserts, their conservation, and how people are able to live with and steward desert ecosystems.

Berlin Agave Yucca Forest Plans call for the perpetual renewal of the current design intent.

Children’s Garden Maze A living circular maze of friendly desert plants engages intergenerational visitors of all ages on the site �� Trail). (see Central Core Trail plan following page 24). The Maze is an enclosed space unto itself in the short-term and potentially an enchanting entry to the future Children’s Garden to the east. The entry and exit are the same point so children do not wander off into the Garden. Shaded seating at the entry encourages caregivers to let older children explore on their own. A drinking fountain refreshes. Paths are at least 5’ wide to allow for wheelchairs to turn around at any point and for an adult and youngster to walk side by side. Pavement is an ADA compliant material. Evergreen screening suggests the Maze is a secret garden and disguises a perimeter fence. Possible Ideas include: • A small water feature with interactive components offering a welcome reward for stalwart adventurers; and • A monumental standing stone anchoring the Maze’s center. Petroglyphs tell a fantastical desert story. Lighting possibly allows the Garden to host playful evening events for adults in this intriguing space. 24

Seep Water Feature Arroyo Terrace/ Seat Wall Arroyo Crossing Standing Stone Interacative Water Feature

Living Walls Berlin Agave Yucca Forest Connection Trellis Eastern Plaza Arroyo Crossing Riparian Path

PPSD Entry

Flowering Wash Webster Vestibule/ Seat Wall Founders Garden

Re-Aligned Path Canopy Trees

New Tribute Garden

Arroyo Overlook

Wildlife Gallery

Ornamental Trees

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Core Trail: Central Core Trail

Arroyo Gallery Cooling shade and breezes welcome people to the center of the Core Trail, a place of unexpected topography and shelter (see Central Core Trail plan following page 24). The Arroyo Gallery has the potential to become a much-loved place for social networking, particularly at night. Three metal bridges, the Arroyo Crossings, span the length of the wash to create the Garden’s innovative equivalent to a canopy walk. The placements give formal expression to the distinct landform and its formative hydrology. The bridge’s design echoes the existing Berlin Agave Yucca Forest bridge to unifying the visual and physical experience of the Garden’s new central gallery. The Crossings’ architectural forms and materials are powerful, subtle complements to the naturalistic vegetation. The Crossings are inevitable expressions of the marriage between human design and natural processes. Winding sinuously, the ADA compliant main path follows a level grade and intersects the three Crossing bridges. The paving is elegantly detailed concrete with stone accents. Skillfully placed rockwork accentuates the wash along its length. Seeps of water (Similar to that in the Agave Yucca Forest) emerge from outcrops adjacent to the Crossings. All planning and design respects and preserves the wash’s functional hydrology. Plantings express the theme of the Flowering Wash, where moisture gradients enable a diversity �� forming the center of the Core Trail. Canopy and ornamental trees dance through the existing vegeta�� . Water loving perennials cluster around the seeps. Species are predominantly native. Vegetation on the south side blends seamlessly into the Wildlife Gallery. This is an interpretive opportunity to discuss seasonal hydrology and its relationship with the Sonoran Desert’�� The Gallery offers a drinking fountain, seating, power, and irrigation. Evening illumination dramatizes the Crossings so they appear to levitate across the wash unsupported. Lighting glazes the canopy foliage to express the Gallery’s spatial volume. Concrete or stone pads permit temporary art exhibit installations.

CHAPTER 3: THE PLANNING VISION

Eastern Plaza and Wildlife Gallery The Eastern Plaza is a 40’ maximum diameter gathering space linking the Core Trail path’s northeastern and southeastern segments with the southern end of the Berlin Agave and Yucca Forest (see Central Core Trail plan following page 24). The Plaza links with the proposed future vestibule into the Plants and People of the Sonoran Desert Loop Trail. A trellis in the northeastern quadrant is the diminutive sibling of the iconic structure on the Desert Portal and shelters a small storage building. The paving is concrete with stone accents. The Eastern Plaza also offers drinking fountain, seating, power, and potable water. The Wildlife Gallery runs between the Eastern Plaza and the Webster Vestibule to the west. Moving the existing walk to the south improves sight lines, pedestrian navigation, and the intersection with the new Eastern Plaza. �� seeds/fruits attract animals, particularly birds and insects. The overall effect is a vibrant mosaic of �� s seasonal cycles. Ornamental trees punctuate this linear space and form smaller rooms, each perhaps with its own planting theme. Vegetation also frames views into the Arroyo Gallery. Aesthetics are naturalistic rather than intensely designed. The vegetation is a palate cleanser between the Berlin Agave Yucca Forest and the Heritage Gallery. Night lighting allows evening use and highlights key specimens within the collection. Possible interpretation communicates the intimate ecological relationships between desert plants and animals in a playful and artistic manner and encourages visitors to welcome wildlife at home. This is an excellent location for stone or concrete pads to support temporary art exhibits. The Arroyo Overlook offers glimpses into the Arroyo Gallery and hovers over the existing swale feeding into the central wash. A�� into the Plants of the Sonoran Desert Nature Loop Trail. �� node for and interpretive introduction into the Loop Trail. A�� Webster Vestibule. This paved pull-off directs people to Webster Center, the existing Café, and Ullman Terrace. Small trees cast dappled shade. The Wildlife Gallery plantings embrace the Vestibule.

Heritage Gallery The site of the collection’s oldest plantings honors the vision and legacy of those who made the Desert Botanical Garden the world-renowned institution it is today (see Southwest Core Trail plan following page 28). Three new features north of the Webster Center comprise this Gallery - the Founders Garden, the Stewards Wall, and the Cardon Plaza. This is an ideal place to share the story about the Garden’s past, present, and future. Two stone paths spiral into the Founders Garden, enticing visitors without letting them directly see their destination. The paths enter at the east and west points of an approximately 30’ maximum diameter circle bisected by the Stewards Wall, two water features aligned on the circle’s north and south points. The Founders Garden’s central portion is compacted gravel dotted with plants. Perimeter seat walls under the shade of small trees encourage meditation. The design sits gently into the existing vegetation and north-facing slope. A backbone of one or two signature plant species rings the space in a ceremonial gesture. Additions are destined to grow into majestic specimens in future decades. �� thrive into the future. The Stewards Wall provides a beautiful space to accommodate special tributes and/or a future donor honor roll. The Wall height of 6’-8’ is human scaled; it welcomes rather than dominates visitors who seek the serenity of the Founders Garden. �� Garden features, possibly the Cardons to the south and Papago Butte to the northwest. The top of wall elevation remains constant as the land slopes to the north. Stone panels engraved with names clad the surface and allow for ongoing additions. Water sheets gently off the Wall’�� garden. Views from the Cardon Plaza move irresistibly to the Garden’s elder giants, the sentinels standing watch over Webster. The Plaza is 30’ maximum in diameter and paved with stone to match that in the Founders Garden. Slabs of native rock form seats along the western perimeter. Dense evergreens screen views into the service and staff areas to the south, west, and northwest. The Founder’s Garden offers irrigation and power.

Center for Desert Living Trail Plans call for the perpetual renewal of the existing design intent.

CHAPTER 3: THE PLANNING VISION

Desert Palm Oasis Gallery This has the potential to be the chic “front yard” of the possible Conservatory (see Painted Desert Paseo plan following page 28). W�� linear spatial volumes of different sizes. The overall ef�� lush vegetation and demanding exploration of what lies around each corner. It is an ideal location for possible daytime social networking, concessions, performances, and intimate evening event rentals. Amenities include seating, drinking fountain, power, and potable water. Desert palms and cycads are the Oasis’ aesthetic backbone and collection focus. The planting design emphasizes the plants’ sculptural forms, textures, and trunks. One or two tall palm species create a uni�� and fragrance to realize a memorable moonlit retreat. Interpretation shares information on arid-adapted palms and palm-like plants, their use in the landscape, distinct aesthetic attributes, and cultural stories. Future access into the Oasis is directly from the possible Conservatory or from the western end of the proposed Opuntia Path. A bridge spans the wash to the south and connects with the Center for Desert Living to complete a secondary circulation loop with the Core Trail.

New Tribute Gallery

Possible Opuntia Garden

New Bridge New Tribute Gallery Arroyo Gallery Entry

Threshold to Future Western Campus

Arroyo Crossing

Event Terrace New Tribute Gallery

Canal Walls/ Waterwalls Storage/ Concession New Bridge New Tribute Gallery

Founders Garden Stewards Wall/ Water Feature Cardon Plaza/ Seat Walls

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Core Trail: Southwest Core Trail

Controlled Gate Access

Desert Vestibule

Opuntia Prospect

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Elevated Wash Walk

Trellis / Seating

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Core Trail: Painted Desert Paseo

Painted Desert Paseo

The Paseo’s primary purpose is linking the Core T�� Trail (see Painted Desert Paseo plan following page 28). It is the not-to-miss spring horticultural celebration of the desert’s vitality�� Trail east to the Desert Vestibule. �� of jewel tone colors accented with rockwork and evergreen plantings. Entry to the Paseo is through the Opuntia Prospect, an opening in the tiered planters of the Desert Vestibule. The Prospect aligns with the proposed future Conservatory to the southwest and overlooks the proposed future Opuntia Garden. The Elevated Wash Walk arcs through the center of the planting linking the Desert Vestibule’s Opuntia Pros�� The Walk completely immerses visitors in the display, and emphasizes the distinctiveness of the experience. It remains at a constant level while the natural topography undulates below its wooden surface. A pair of metal trellises anchor the Walk’s center point, shades seating, and �� visitors breath away. Native cacti, agave, and ornamental grasses form a year-round framework for the ephem��

CHAPTER 4: REALIZING THE MASTER PLAN

Project Clusters and Sequencing �� opportunities as they arise. The Core Trail Master Plan is therefore a menu of options including renovations and new construction. A selection of options of�� tions hopefully appealing to a range of donors and other benefactors. The Desert Botanical Garden is able to evaluate possible sequences of projects as part of its ongoing operations and strategic planning. �� and stewardship of new gardens, landscapes, buildings, and facilities. Doing so involves raising additional monies during capital campaigns. The Project Clusters and Sequencing diagram (following page 32) groups projects by related theme and identity area (see Identity Areas diagram following page 12). The Garden will determine which projects are able to occur independently of others and which are inextricably related due to construction phasing, utilities and other factors. Future Considerations Addressing service access routes is critical during planning and design. The relatively ample spaces of the Western and Eastern campuses offer potential for intentionally adding dedicated maintenance roads and work yards for staff and vendors. Due to limited space within the Central Campus, the Core Trail Master Plan continues using pedestrian routes for necessary staff activities.

Additional Resources The following writings outline the creative exploration process and compile detailed ideas beyond the �� Trail Master Plan text. • 20 Year Physical Master Plan, March 5, 2008, by Spurlock Poirier Landscape Architects; • Task Force #3 Strategic Planning recommendations; • Program Statements for existing galleries and exhibits; • Statement of Purpose for Tribute Garden(s) from the Board’s Donor Recognition Committee; • Core Trail master planning documentation by Studio Outside. �� for future reference. o Research Summary (March 30, 2011; addendum April 3, 2011) o Workshop 1 Summary (April 28, 2011) o Workshop 2 Summary (August 9, 2011)

LEGEND S. Sequential Projects S.1 S.1A S.2 S.3 S.4 S.5 S.6 S.7

I.1

S.4

Desert Portal Desert Vestibule Heritage Gallery Arroyo Gallery Painted Desert Paseo Deserts of the World Wildlife Gallery Cactus and Succulent Gallery

I. Independant Projects S.1-A

I.1 I.2 I.3 I.4

I.2 S.7

Future Projects

I.3

S.5

S.1

Butterfly Pavilion Stardust Plaza Childrenâ&#x20AC;&#x2122;s Garden Maze Desert Palm Oasis Gallery

Future Projects

S.3 S.6

I.4

S.2

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N O R TH O c to b e r, 2 0 1 1

Core Trail: Project Clusters and Sequencing Diagram

ACKNOWLEDGEMENTS

Financial Support The master plan for the design of the Core Trail, the Desert Discovery Trail, was generously funded by a Piper Fellows Organizational Enhancement Award from the Virginia G. Piper Charitable Trust as part of Elaine McGinn’s Piper Fellowship.

Planning Participants The Garden included a wide-range of stakeholders in the creative group process of envisioning the Core Trail’s future. Staff, board members, and volunteers all contributed their expertise, perspectives, ideas and vision during planning with Studio Outside, as well as the Strategic Planning Task Force and Exhibit Development Committee. The list of participants for these planning sessions includes: • Cathy Babcock, Assistant Director of Horticulture • Jim Carlson, Director of Security • Shelley Cohn, Board of Trustee • Beverly Duzik, Director of Development • Marcia Flynn, Director of Event Services • Dawn Goldman, Volunteer and Board of Trustee • Jeff Hebets, Board of Trustee • Brian Kissinger, Director of Horticulture • Susie Klein, Volunteer • Melodie Lewis, Board of Trustee • MaryLynn Mack, Deputy Director • Joe McAuliffe, Director of Research • Chris McCabe, Director of Facilities • Kim McCue, Program Director, Conservation of Threatened Species and Habitats • Elaine McGinn, Director of Planning and Exhibits • John Sallot, Director of Marketing • Ken Schutz, The Dr. William Huizingh Executive Director • Nancy Swanson, Board of Trustee • Bob Tancer, Board of Trustee • Tina Wilson, Director of Education

824 Exposition Aveune Suite 5 Dallas Texas 75226 214.954.7160 www.studiooutside.us

Design Team

• Tres Fromme, Lead Designer and Facilitator • Brian Halsell, Designer and Project Manager • Allison Baker, Graphic Designer and Production • Jessica Pfeffer, Graphic Support • Tary Arterburn, Principle-in-Charge

1201 N. Galvin Parkway Phoenix, AZ 85008 480.941.1225 www.dbg.org