How to grow radishes in a raised bed in England

To grow radishes in England, sow them thinly where they are to grow, 1 cm deep and 2.5 to 5 cm apart, in an open spot and soil you can keep moist. Sow a short row every few weeks from spring to late summer. Salad radishes are ready in about four to six weeks; pick them small, at about 2.5 cm across.

This guide covers when to sow radishes, how far apart to grow them in a raised bed, how to harvest them before they turn woody, and why radishes sometimes make plenty of leaves but no roots. It also shows what happened when we grew a trough of radishes ourselves.

Radishes at a glance

When to sow radishes

The RHS says salad radishes do best sown in spring, early summer and late summer. Mild spring weather suits them best: in hot, dry spells they tend to bolt and the root does not develop. With soil warmed under cloches, you can start in February.

Sowstory plans salad radishes into the bed from March to August. Because each batch is ready so quickly, sow a short row every few weeks rather than one long one. Gardeners' World suggests sowing every few weeks through the summer for a regular supply. See what to sow in March for the first outdoor sowings and the vegetable sowing calendar for the rest of the year.

Winter radishes, such as 'Black Spanish Round' and 'China Rose', are a different crop. The RHS says to sow them in July or August: sown earlier, they tend to bolt instead of making a root.

How to sow

• Rake the soil to a fine, level surface and remove stones and weeds.
• Sow salad radishes 1 cm deep, 2.5 to 5 cm apart, in rows 15 cm apart.
• Water the row, and keep it moist. The RHS says seedlings usually appear in 7 to 10 days.
• If seedlings come up too close, pull the smaller, weaker ones as soon as possible. The RHS says thinning should not be needed if you sow at least 2.5 cm apart.

Radish spacing in a raised bed

Sowstory plans salad radishes in rows 15 cm apart, with plants 2.5 cm apart in the row, which is the closest spacing the RHS gives. Rows are kept short, between 30 and 80 cm, and Sowstory places up to four rows at a time. An 80 cm row at 2.5 cm spacing holds about 32 radishes, which is plenty for one batch.

For other crops, see the vegetable spacing chart.

Why radishes make leaves but no roots

This is the most common radish complaint. The RHS gives three reasons why the roots fail to swell:

• Dry soil. Radishes short of water may not form a root.
• Heat. In hot, dry weather salad radishes tend to bolt (send up a flower stem), and the root does not develop.
• Overcrowding. Each plant needs room for its leaves to develop and the root to swell. Gardeners' World also advises thinning seedlings sown close together so that individual plants can form roots.

So the fixes are to sow thinly, thin early, water steadily and sow in spring or late summer rather than in midsummer heat. The RHS also recommends an open, sunny site, with light shade only to keep salad radishes cool in warm weather.

Growing radishes in raised beds

Where to put them

Give radishes an open, sunny position. In midsummer, the RHS suggests a cooler spot in light shade, out of the midday sun. Sowstory lets them go in spots with four to six hours of direct sun.

Salad radishes need little depth: Sowstory plans them only where the bed has at least 20 cm of soil. Long winter and oriental radishes need deep soil, as some grow over 30 cm long. Our guide on how deep a raised bed should be covers depth for each crop.

Filling gaps

Radishes are one of the best gap fillers in a bed. The RHS suggests sowing them between slower crops such as peas and potatoes. You can also sow a few radish seeds along a row of slow-germinating parsnips or onions: the radishes come up first, mark the row and are pulled before they get in the way. Our raised bed layout ideas show how quick crops fit around longer ones.

If you want radish batches planned around the rest of your bed, Sowstory lays out the rows to scale, tells you how many plants fit and gives a month-by-month plan for England. It is coming soon to the App Store, and your first bed plan is free.

Watering radishes

Steady moisture matters more for radishes than for most crops, because they grow so fast.

• Keep the soil consistently moist. The RHS says roots short of water may fail to swell.
• Water evenly. Uneven watering causes split roots. Split radishes are usually still edible.
• Check containers and seedlings often. They dry out fastest.

Harvesting radishes

Salad radishes can be ready in as little as four weeks, and usually take four to six weeks. Early sowings in cooler weather take six to eight weeks. Pull them when the roots are about 2.5 cm across.

Do not leave them too long. The RHS says older radishes become pithy, hot and inedible, and Gardeners' World notes that they quickly turn woody. That is another reason to sow small batches often.

Sowstory reserves bed space for about eight weeks for each batch of salad radishes, so the space can be resown or given to another crop afterwards.

Winter radishes can stay in the ground and be pulled as needed from November, or be lifted and stored somewhere cool.

Growing radishes in pots

Salad radishes grow well in containers. The RHS suggests a large container at least 30 cm wide and deep, filled with peat-free multi-purpose compost. Containers dry out quickly, so water regularly. Our own radishes, grown in a trough only 15 cm deep and with no direct sun, made leaves but no roots, as described above.

Choosing varieties

The RHS lists 'Scarlet Globe', 'French Breakfast 4 Francis' and 'Amethyst' among salad radishes with its Award of Garden Merit. Gardeners' World adds 'Marabelle' and 'Ping Pong', both also award winners, and the popular 'French Breakfast'. For winter radishes, the RHS names 'Black Spanish Round' and 'China Rose', and 'April Cross' is a long white mooli type.

A radish year in England

Common radish problems

Bolting

Bolting is when a radish sends up a flower stem; once it does, the root will not develop. The RHS says it happens mostly in hot, dry weather, and that some radish varieties flower naturally as the days lengthen. Keep plants well watered and pull any that start to bolt.

Woody, hot or split roots

Woody, very hot radishes are usually too old: pick them at about 2.5 cm across. Split roots usually come from uneven watering.

Slugs and snails

Slugs and snails may eat seedlings, especially in damp weather. Gardeners' World describes young radish leaves as a magnet for them, so protect the row after sowing.

Flea beetles and cabbage root fly

Flea beetles leave tiny holes in the leaves. The RHS says the damage is usually only cosmetic; Gardeners' World suggests growing under horticultural fleece. Cabbage root fly larvae tunnel into roots, mainly in late summer. The RHS says they rarely trouble quick salad radishes but are a risk to winter and oriental types left in the ground longer, which can be covered with fleece or insect-proof netting.

Sources

• RHS: How to grow radishes
• RHS: Bolting in vegetables
• BBC Gardeners' World: How to grow radishes
• Sowstory knowledge base, release v1.4
• Our own trough trial, autumn 2026 (see how we test)