Plants for acid soils with bursts of yellow

Plenty of plants thrive in the lower pH of acidic or ericaceous soil, so it’s perfectly possible to create a full and attractive border even in these sometimes challenging conditions

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<i>Corylopsis</i> offers welcome spring colour
Corylopsis offers welcome spring colour

Quick facts

  • For some plants, acidic soil is essential for them to thrive – these are often referred to as ericaceous plants
  • Acid conditions are produced by the underlying rock type, which is outside of gardener control, so it’s best to use plants that naturally prefer these soil conditions

The planting plan

James Lawrence, RHS Principal Horticultural Advisor, has designed this simple, attractive, and most importantly, sustainable border design for you to try at home with plants that are easy to grow, widely available and look good together.

This planting design provides a range of plants with splashes of yellow that, once established, will thrive in acidic soil and provide colour and interest throughout the year. A simple planting plan helps to create depth, interest and good coverage in a border.

Acid soil, pastel shades

Choosing plants for acid soil

These plants have been selected because their preferred growing condition is acidic soil. By using plants that are naturally adapted to these conditions, we can enjoy healthier plants and lower inputs compared with trying to grow plants that are less well suited.

The Epimedium and Gentiana provide some groundcover and will help prevent erosion of bare soil. The groundcover can also help to reduce evaporative moisture loss from the soil surface, and suppress weed growth.

Additional organic mulching, preferably with homemade compost, can further improve soil moisture retention and weed suppression. Mulches should be spread when the soil is already moist, to help trap some of that moisture before it dries out in summer. 

1 - Abies koreana ‘Silberlocke’
2 - Hamamelis x intermedia ‘Arnold Promise’
3 - Epimedium x warleyensis
4 - Gentiana ‘Strathmore’
5 - Gaultheria mucronata ‘Bell’s Seedling’
6 - Corylopsis pauciflora
1 - Abies koreana ‘Silberlocke’ is a small evergreen tree with dark needle-like leaves, which curve upwards to show the white undersides. Large purple-brown cones are produced in spring.

2 - Hamamelis x intermedia ‘Arnold Promise’ is a large, spreading, open shrub. The green leaves turn red and yellow in autumn, and fragrant, bright yellow flower tassels festoon the bare stems in late winter.

3 - Epimedium x warleyense is a hardy perennial forming a spreading evergreen mound of divided leaves, held on thin wiry stems. These often have strong red tints, especially when young. It bears sprays of coppery red and yellow flowers in spring.

4 - Gentiana ‘Strathmore’ is a mat-forming herbaceous perennial with narrow green leaves and sky-blue, funnel-shaped flowers with paler stripes in autumn.

5 - Gaultheria mucronata ‘Bell’s Seedling’ is a small, dense evergreen shrub with tiny dark leaves and clusters of small white flowers in late spring and early summer. These ripen into dark crimson berries in autumn.

6 - Corylopsis pauciflora is a deciduous shrub with green leaves that are tinged red when young. It has fragrant, pale yellow, bell-shaped flowers, which open before the leaves in spring.

About acidic or ericaceous soil

Acidic soils can be found all over the country in pockets, but are more generally found in south-western England, Wales and Scotland. The low pH is caused by the underlying bedrock. It is easy to check your soil’s pH using a kit bought from a garden centre, but you can often get a good indication from the plants which already thrive in the soil near you. 
 

The challenge of growing on acidic soils

Strongly acidic soil can make it hard for some mineral nutrients to be taken up by plant roots, meaning the plants don’t grow and develop well. However, if your plants have adapted to naturally thrive in those conditions, they will grow much better. 
 

Why choose a sustainable planting combination

Using the ethos of ‘right plant, right place’ to create a sustainable planting combination is great for the environment. It helps to avoid waste and the use of products and practices needed to try and help ailing plants, such as the application of fertiliser. It also creates robust, long-lived planting that benefits soil health and garden biodiversity.

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