Ten Pollution-Tolerant Plants

from Worcestershire NOW - SEPTEMBER 2021

World Alzheimer’s Day

Just like humans, plants that live in cities, industrial, or built-up areas are susceptible to pollution. As they rely on carbon dioxide in clean air for photosynthesis and to prevent fungal diseases, most plants struggle to thrive in polluted areas, however there are some species that will stand the smog.

1. Pyrus calleryana ‘Chanticleer’: This ornamental pear is an exceptionally good tree for small urban gardens, with its upright, narrow shape and branches that are smothered with white blossom early in spring (April to May). The leaves turn a vibrant red and purple in the autumn before falling and some years, the tree will produce small inedible brown fruits. It does best in a moist but well drained soil (clay, sand or loam) and in full sun.

2. Buddleja: Known as the butterfly bush, Buddleja produces clusters of deep scented flowers from midsummer into autumn (July to September). Rich in nectar, this fast-growing, hardy deciduous shrub attracts butterflies, bees and other insects and thrives in any well-drained soil (chalk, loam or sand).

3. Camellia: Producing rich, colourful flowers with ruffled petals and golden stamens in late winter into spring (February to April), which are offset by glossy evergreen leaves, the Camellia proves that beautiful plants can also be tolerant to pollution. Plant in light shade and in shelter and in moist but well-drained, humus-rich, limefree soil (loam) or in a container, in ericaceous (lime-free) compost.

4. Buxus sempervirens: This classic British native evergreen is ideal for low hedging, boundaries or divisions in formal gardens in both modern and traditional settings. It responds well to being trimmed and thrives in the shade and most well-drained soils (chalk, loam or sand). It’s excellent for growing in containers, as topiary and for training as feature plants.

5. Lonicera x heckrottii ‘Gold Flame’: This honeysuckle flowers in summer (June to August) and bears tubular pink flowers with warm orange-yellow petals. It has a delicious fragrance and bees and butterflies love it! It doesn’t have the twining branches that many other honeysuckles do, so needs to be supported. It’s best in moist but well-drained soil (chalk, loam or sand) in sun or partial shade and ideal for informal borders and cottage garden style planting.

6. Ginkgo biloba: This large deciduous tree will be too big for small urban gardens, but it’s worth mentioning, as it’s very tolerant to pollution. It has fan-shaped leaves, which turn yellow in autumn and on female trees, produce yellow fruits which smell rather unpleasant! It will thrive in well-drained soil (chalk, loam, sand or clay).

7. Viburnum x bodnantense ‘Charles Lamont’: This is a superb variety of viburnum as it has bright pink, sweetly scented flowers which open on dark stems from November to May. It’s a vigorous, upright shrub, that looks good all year and is easy to grow in moist but welldrained fertile soil (chalk, loam or sand), in sun or light shade and sheltered from cold winds.

8. Berberis: This easy to grow barberry has spiny shoots and simple leaves. Soft yellow or orange flowers appear in spring (April to May) and are followed by small berries in the autumn. This deciduous or evergreen shrub will succeed in a wide range of conditions. Plant in full sun or partial shade in well-drained humus-rich soil (chalk, loam or sand), although it will be tolerant of most soils as long as they are reasonably well-drained.

9. Chaenomeles: Chaenomeles flower in spring and produce edible fruits in autumn, which can be used for jellymaking. It provides early nectar for bees and thrives in any well-drained, fertile soil (chalk, loam or sand), in sun or light shade. It’s great for training under house windows or on low walls and fences.

10. Escallonia ‘Iveyi’: This is a handsome, vigorous, large evergreen shrub, quite different from other escallonias, with larger, glossy, rich green leaves and clusters of scented white flowers in mid and late summer (July to August). Plant in well-drained, fertile soil (chalk, loam or sand) in full sun or partial shade, sheltered from cold winds. It can be grown in the open in mild areas, but it’s best grown against a southfacing wall in cold areas. n