New Views in the Landscape

(continued from page 50) tion or “sharp” sand) is common. Be wary of clay as it can adversely affect drainage. These soil “recipes” universally are meant to support a wide range of alpine plants that will extend deep roots into the cool recesses of these crevices.

When packing soils into the crevices and gaps, ensure no air pockets and leave some room for the later topdressing as plants are installed. A minimum of 8” of rooting depth should be provided which will encourage alpine plants to send dramatic and deep roots for anchoring and moisture. Smaller rocks and rock “slivers” may be needed to help create smaller pockets and to minimize erosion. More organic soil pockets can be created as needed for plants that require a bit more pampering. A prudent recommendation from Seth and Spriggs mentions “erring on the side of more open soil with fewer nutrients that can be modified in the future as needed.”

The Plants

Rock garden plants tend to be short (under 12”), and slowgrowing with foliage that moderates exposure to both the sun and wind. The low-profile nature of these alpine plants is a survival strategy and the crevice garden can become an effective garden for establishment due to the diverse microclimates related to rock placement, soil preparations, orientation and layout. Most crevice appropriate plants are under 6” in height. With so many spots to include these smaller gems and treasures, a crevice garden amounts to more plants in a smaller space. The diversity of available plants is astounding although it’s likely you’ll need to connect with additional resources for plants and seeds.

Maintenance

Early weeding efforts should be consistent and when preparing your initial soil mixes, be wary of including any soils known to have weed issues or surviving plant roots (i.e. bindweed). In time, weeding needs should become minimal as the combination of leaner soils and gravel topdressing will mitigate those challenges. Watering as needed is the rule of thumb, particularly during the establishment phase of new plantings. Consider those areas that might need additional watering although thoughtful layouts with rocks and proper soil preparations will help direct water to support the garden. The demise of some plants is inevitable over time but keep in mind the importance of removing organic matter that might settle into the crevices and increase weed pressure. Keep those gaps clean and lean.

This article is certainly not comprehensive regarding the mechanics of designing and installing the crevice garden. However, I do strongly recommend the book by Seth and (continued on page 54)