Choosing Plants for Chalk Soil: Perennials and ClimbersChoosing plants for chalk soil can be difficult so we've picked out some suitable perennials and climbers to get you started.
If your soil is chalky you will need plants that can cope with quite a high pH (strongly alkaline), and also with the shallow topsoil that is typical of chalk areas. Some of our selected plants for chalk soil really thrive in these conditions, others are chalk tolerant but should still do well. If you would like some ideas for trees and shrubs for chalk soil go to Choosing Plants for Chalk Soil: Trees and Shrubs. Don't forget, if you would like to extend the range of plants you can grow, you can improve or amend very thin chalk soils by adding plenty of organic matter.
Plants for Chalk Soil: Perennials![]() Form: perennial Foliage: evergreen Hardiness: UK - hardy; North American hardiness zones 3 to 8 Soil: any well drained soil; tolerates chalk Situation: sun or partial shade Height: 60cm (24in) Spread: 60cm (24in) Awards: RHS AGM Reasons to grow: Splendid large leathery leaves turning bronze red in winter. Spikes bearing clusters of crimson flowers in early spring. Excellent evergreen ground cover also useful for softening the edges of paths and borders. Also consider: Bergenia cordifolia for pink flowers; B. cordifolia 'Purpurea' for bronze winter foliage and magenta flowers; the smaller Bergenia 'Silberlicht' (30x50cm, 12x20in) has white flowers flushed pink.
Dianthus 'Doris' (Pink)
Form: perennial Foliage: evergreen Hardiness: UK - hardy; North American hardiness zones 5 to 9 Soil: thrives on chalk but will grow in any well drained soil Situation: sun Height: 45cm (18in) Spread: 30cm (12in) Awards: RHS AGM Reasons to grow: Deliciously scented pink blooms over a long period from early summer to early autumn and an excellent and long lasting cut flower. One of the best flowering plants for chalk soil. Also consider: 'Mrs Sinkins' for white flowers; 'Bovey Belle' for clove scented fuschia pink flowers. ![]() Form: perennial Foliage: semi-evergreen Hardiness: UK - hardy; North American hardiness zones 4 to 8 Soil: prefers chalk or alkaline soil but will grow in any well drained soil Situation: full sun Height: 1m (40in) Spread: 50cm (20in) Reasons to grow: The attractive basal rosettes of felted grey-green leaves produce tall spikes, often multi-branched, of golden yellow flowers from June to August. Each flower has eyecatching violet stamens. This is a excellent form and longer lived than many other types. if you deadhead after the first flowering, you will get a second flush of flowers later in the year. Also consider: Verbascum bombyciferum for a taller plant (1.8x1m, 6x3ft) with exceptional woolly grey green foliage and pale yellow flowers; Verbascum 'Cotswold Beauty' for bold spikes of peachy pink saucer shaped flowers; Verbascum 'Helen Johnson' is a smaller plant (90x30cm, 3x1ft) with unusual pinkish brown flowers. Plants for Chalk Soil: Climbers![]() Form: climber Foliage: semi-evergreen Hardiness: UK - hardy; North American hardiness zones 5 to 9 Soil: any moderately fertile soil; tolerates chalk Situation: full sun or partial shade Height: 10m (33ft) Spread: 9m (30ft) Reasons to grow: This is one of our favourite plants for chalk soil - a fast growing yet graceful climber with semi-evergreen leaves and clusters of scented purplish red flowers in late spring and early summer. In hot summers it may produce unusual sausage shaped purple fruits. ![]() Form: climber Foliage: deciduous Hardiness: UK - hardy; North American hardiness zones 4 to 9 Soil: thrives on chalky, alkaline soils but will grow in any well drained soil Situation: sunny position but with a cool shady root run Height: 2-3m (6.5-10ft) Spread: 1m (3ft) Awards: RHS AGM Reasons to grow: Absolutely stunning large wine red flowers with contrasting yellow anthers are produced from mid summer well into autumn. Also consider: Clematis 'Comtesse de Bouchard' for bright mid pink flowers; Clematis 'Miss Bateman' for palest pink flowers. Need More Information?You can find information and advice about garden soil, including links to other soil-related pages, at Healthy Garden Soil. |
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