Plants for clay soils with white and blue flowers
Plenty of plants, of a variety of shapes, sizes and colours, thrive in clay soil, so it’s perfectly possible to create a full and attractive border even in these sometimes challenging conditions
Quick facts
- The regular addition of garden compost will gradually make clay easier to work
- Clay is usually very fertile soil
- Clay is slow to warm in spring, but stays warmer into autumn
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The planting plan
This planting design provides a range of plants that, once established, will thrive in clay soil and provide a variety of interest throughout the year. A simple planting plan helps create depth, interest and good coverage in a border.
Choosing plants for clay soil
These plants have been selected because their preferred growing condition is clay soil. By using plants that are naturally adapted to these conditions, we can reduce the potential problems that are more likely with plants that are less well suited.
The Ajuga and Geranium provide some groundcover and will help prevent erosion of bare soil. The groundcover can also help to reduce moisture evaporation from the soil surface and suppress weed growth in summer.
Until the plants have filled out, an organic mulch, preferably homemade compost, can help to lock in soil moisture and suppress weeds. Mulches should be spread when the soil is already moist to help trap some of that moisture before it dries out in summer.
2 - Viburnum ‘Eskimo’ is a semi-evergreen shrub with glossy, leathery, dark green leaves. In mid-to-late spring, pink-tinged buds open to tubular, pure white flowers in spherical clusters.
3 - Ajuga ‘Catlin’s Giant’ is a semi-evergreen perennial forming a mat of glossy purple-brown leaves with erect spikes, up to 30cm tall, of blue flowers
4 - Geranium ‘Orion’ is a spreading perennial, which is ideal for groundcover. It has deeply-lobed leaves and masses of cup-shaped, lavender-blue flowers with purple veins and a white centre, borne over a long period in summer.
5 - Symphyotrichum ‘Little Carlow’ is a bushy herbaceous perennial, with small heart-shaped leaves and a hazy mass of single, pale lilac-blue flowers, with a yellow central disc in early autumn.
6 - Hydrangea quercifolia ‘Snowflake’ displays boldly lobed, oak-like leaves that turn orange and red in autumn and large, conical panicles of double, white flowers which often show a pink flush in autumn.
About clay soils
The challenge of growing on clay soils
Why choose a sustainable planting combination
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