How to improve sandy soil in your garden

Sandy soil: easy to dig, hard to feed

Digging in sandy soil is a dream. Your spade glides through effortlessly. But that lightness has a downside: water and nutrients drain straight through. An hour after rain, the top layer is bone dry again. Your plants are permanently thirsty and hungry.

GardenWorld helps you visualise a garden design suited to your soil type. Pick plants that cope with sandy conditions and save yourself disappointment.

Understanding the problem

Sand particles are large compared with clay or silt. Between them sit big pores where water rushes through. Nutrients wash away with it. What you feed today is gone next week. Breaking that cycle is possible, but it needs a different approach than clay soil.

Compost: the core solution

Organic matter is the answer. Compost acts as a sponge in sandy ground. It holds moisture and locks in nutrients. Work at least 5 centimetres of mature compost into the top 20 centimetres every season. Garden centres and RHS partner shops stock bagged compost in bulk.

Half-rotted leaf mould is even better. It breaks down more slowly and stays active in the soil longer. Collecting autumn leaves and composting them pays double dividends.

Adding clay granules

Sounds counterintuitive, but small amounts of clay or bentonite improve sandy soil. Bentonite is a clay granule available from garden centres. It boosts the soil's ability to retain water and nutrients. Use about 2 kilograms per square metre and work it in shallowly.

Mulching: the easiest improvement

A 5 to 8 centimetre layer of mulch works wonders on sandy soil. It protects against drying out, stabilises soil temperature and slowly adds organic matter. Wood chips, straw or cocoa shells all work well. Lay the mulch after the ground has been thoroughly watered.

Feeding sandy soil differently

On sandy ground, a single big spring feed doesn't work well. Half the nutrients leach away before your plants can absorb them. Feed little and often instead. A light application every four to six weeks is far more effective than one seasonal dose.

Choose slow-release organic fertilisers where possible. They release nutrients gradually and resist leaching. Your local garden centre will have good organic options.

Plants that love sandy soil

Not all plants struggle on sand. Lavender, sage, sedum, grasses and silver-foliage plants do brilliantly. Mediterranean herbs like thyme and rosemary are made for dry, lean ground.

Trees and shrubs for sandy soil

Birches, pines and broom are natural sand-dwellers. Hawthorn and privet cope well too. Choose deep-rooting species, as they reach moisture further down in the soil profile.

Green manures on sandy soil

Sow vetch, rye or phacelia in autumn. These green manures add organic matter, protect against erosion and some even fix nitrogen from the air. In spring, dig them in and plant on top.

Better step by step

Improving sandy soil is an ongoing process. Every season you add compost and mulch, the ground gets a bit better. After three years, you'll notice the soil is darker, holds moisture longer and dries out less quickly. Design a garden suited to your improved sandy soil at GardenWorld and enjoy a garden that gets lovelier every year.