sandywell-drainedpooracidicneutral

Sandy soil

A soil that is easy to work, warms up quickly in spring, but needs regular inputs so it does not become exhausted.

Simple definition

Sandy soil is made of large sand particles that retain neither water nor nutrients. It is very free-draining, light, easy to work, but often poor. It is a soil that warms up quickly in spring: ideal for early sowing.

Visual and tactile appearance

It slips through the fingers like sugar and does not form a ball when squeezed in the hand. Its colour is light, beige to blond. Watering infiltrates almost instantly. To the touch, it is rough and gritty.

Main properties

Excellent drainage: no standing water, well-aerated roots.
Warms up quickly in spring.
Low capacity to retain water and nutrients (rapid leaching).
Often acid to neutral, sometimes very poor in organic matter.

Advantages in the garden

Easy soil work, even in winter, with no risk of compaction.
Early sowing possible: carrots, radishes, salads from February-March.
Ideal for long roots that push down without obstruction.
No problem of asphyxiation or root rot.

Limits & common problems

Dries out very fast in summer: frequent watering essential.
Poor in fertilising elements: frequent nitrogen and potassium deficiencies.
Little structure: collapses easily, no cohesion.
Weak microbial life without regular organic-matter inputs.

Recommended improvements

Add plenty of compost and well-rotted manure, every year.
Thick permanent mulch (straw, RCW, dried clippings) to limit evaporation and feed the soil.
Sow high-biomass green manures: rye, vetch, phacelia, to incorporate shallowly.
Incorporate a little bentonite clay or clay soil to improve retention.
Water often and lightly rather than rarely and heavily.
Favour organic mulches that decompose quickly and give the soil structure.

Suitable plants

Carrot
Long-rooted varieties are made for deep, sandy soil; water regularly, because swings in moisture split the roots.
Radish
The root swells without obstacle in a light soil, provided it is watered often: short of water, it fails to swell.
Onion
It prefers a light, rich, well-drained soil; in heavy soil waterlogged in winter, sets planted in autumn rot.
Garlic
It likes soil that drains quickly, as damp makes it more prone to disease; in light soil, planted deeper, it forms bigger bulbs.
Strawberry
It likes a well-drained, slightly acid soil; as sand is poor, enrich it with compost before planting.
Thyme
A plant of light, well-drained soils, which above all fears winter damp.
Rosemary
It needs a light soil that drains freely, in the sun.
Lavender
It wants a soil that drains fast, rather poor and dry: sand offers just that.
Sage
It needs a very free-draining, light, sandy soil, and an overly wet winter can kill it.
Bean
It is sown once the soil has warmed, and sand warms up quickly in spring; it also likes a well-drained soil.

Plants to avoid or watch

Celery
It wants a soil that never dries out, otherwise its stalks stay thin and stringy: sand dries quickly.
Cabbage
It likes firm, rich ground, whereas sand is loose, poor and quick to dry.
Mint
To watch: it grows almost anywhere as long as the soil does not dry out too much, which sand quickly does in summer.
Comfrey
To watch: it tolerates most soils but prefers a moist one, which sand does not keep.

These reasons rely mostly on the RHS and on Plants For A Future, both in the United Kingdom: they describe an oceanic climate. In another climate, each plant's page gives its dates and advice for your climate zone.

Watering tips

Water often and lightly in summer, ideally in the morning or at the end of the day. Drip or ollas very effective. Thick mulch sharply reduces the need.

Guilds suited to this soil

These small plant groupings work particularly well on this type of soil.

Central

Maize

The Three Sisters

A classic Native American planting: three plants that support one another on the same mound.

Central

Strawberry

Strawberry guild

An efficient small system for edges, containers and the base of fruit trees: fruit, natural protection and biodiversity around the strawberry.

See all guilds →

Link with crop rotation

Well suited to Alliums (garlic, onion, leek), to roots (carrot, radish) and to Mediterranean aromatics. Insert a legume (field bean, clover) regularly to fix nitrogen naturally.

Heavy metals: caution

Higher-risk behaviour: sand retains heavy metals poorly, so they are more available to roots. Coupled with an often-acid pH, this type of soil amplifies the bioavailability of metals such as cadmium or zinc. If there is a suspect urban or industrial history, a soil analysis is particularly recommended. See the Heavy metals concept and the Choosing and testing your ground guide.

Definition: Heavy metals →Guide: Choosing and testing your ground →

Key takeaways

“Once I know my soil, I know what to plant, what to pair, what to improve and which guild to build.”

Sources

RHS (Royal Horticultural Society) : Soil types (rhs.org.uk/soil-composts-mulches/soil-types)
Baize, D. (2000). Guide des analyses en pédologie (2e éd.). Paris : INRA Éditions.
Kabata-Pendias, A. (2011). Trace Elements in Soils and Plants (4e éd.). Boca Raton : CRC Press.
RHS (Royal Horticultural Society) : How to grow carrots (rhs.org.uk/vegetables/carrots/grow-your-own)
RHS (Royal Horticultural Society) : How to grow radishes (rhs.org.uk/vegetables/radishes/grow-your-own)
UC IPM (université de Californie) : Cultural Tips for Growing Radish (ipm.ucanr.edu)
RHS (Royal Horticultural Society) : How to grow onions (rhs.org.uk/vegetables/onions/grow-your-own)
Plants For A Future, « Allium cepa » (pfaf.org/user/Plant.aspx?LatinName=Allium+cepa)
RHS (Royal Horticultural Society) : How to grow garlic (rhs.org.uk/vegetables/garlic/grow-your-own)
RHS (Royal Horticultural Society) : How to grow strawberries (rhs.org.uk/fruit/strawberries/grow-your-own)
RHS (Royal Horticultural Society) : How to grow thyme (rhs.org.uk/herbs/thyme/grow-your-own)
RHS (Royal Horticultural Society) : How to grow rosemary (rhs.org.uk/herbs/rosemary/grow-your-own)
RHS (Royal Horticultural Society) : How to grow lavender (rhs.org.uk/plants/lavender/growing-guide)
Plants For A Future, « Salvia officinalis » (pfaf.org/user/Plant.aspx?LatinName=Salvia+officinalis)
RHS (Royal Horticultural Society) : How to grow French beans (rhs.org.uk/vegetables/french-beans/grow-your-own)
RHS (Royal Horticultural Society) : How to grow celery (rhs.org.uk/vegetables/celery/grow-your-own)
RHS (Royal Horticultural Society) : How to grow cabbages (rhs.org.uk/vegetables/cabbages/grow-your-own)
Plants For A Future, « Mentha spicata » (pfaf.org/user/Plant.aspx?LatinName=Mentha+spicata)
Plants For A Future, « Symphytum officinale » (pfaf.org/user/Plant.aspx?LatinName=Symphytum+officinale)

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