Corn Salad: Winter Salad That Survives Frost

Corn salad is the salad leaf that keeps producing when everything else has given up. While lettuce rots in November rain and rocket bolts at the first sign of cold, corn salad sits quietly in the soil and pushes out fresh, green rosettes through frost, snow, and temperatures that would kill most vegetables outright.

Also known as lamb’s lettuce or mache, this small, unassuming plant (Valerianella locusta) has been gathered wild in British fields for centuries. It grows in poor soil, tolerates shade, and asks for almost nothing in return. Yet it remains one of the most overlooked crops in UK kitchen gardens. If you already grow lettuce and rocket, corn salad fills the gap they leave wide open: fresh salad leaves from November to March.

What is corn salad and why grow it?

Corn salad is a small annual plant that forms neat rosettes of soft, spoon-shaped leaves 8-15cm across. It belongs to the Valerianella genus and has no relation to sweetcorn despite the name. The common name comes from its historical habit of growing wild in cornfields across Europe. In France, it is called mache and appears on restaurant menus as a winter delicacy.

The flavour is mild and nutty with a soft, almost buttery texture. It lacks the bitterness of endive and the sharpness of watercress. Children who refuse other salad leaves often eat corn salad happily. Mixed with beetroot and toasted walnuts, it makes one of the finest winter salads you can put on a plate.

The real value of corn salad is its timing. It produces when nothing else will. While your summer salad crops are long finished and spring sowings are months away, corn salad fills the hungry gap with reliable, fresh greens. For anyone trying to eat from the garden year-round, it is essential.

Which corn salad varieties grow best in the UK?

Three varieties dominate UK seed catalogues. Each performs well in British conditions, but they differ in leaf size, bolt resistance, and speed of growth.

Vit is the standard choice and the one most gardeners start with. It forms compact, dark green rosettes of small, rounded leaves. Maturity in 50-60 days from sowing. Excellent cold hardiness. Widely available from Thompson and Morgan, Kings Seeds, and most UK suppliers.

D’Etampes (also sold as Large-leaved or Grosse Graine) produces bigger, paler leaves with a slightly milder flavour. It is the traditional French market variety and yields more per plant than Vit. Slightly less cold-hardy but still survives most UK winters without protection.

Jade is the slowest to bolt in spring warmth, making it the best choice for late winter and early spring harvests. Leaves are darker than D’Etampes but larger than Vit. It bridges the gap between the last winter pickings and the first spring sowings of lettuce.

When to sow corn salad in the UK

Corn salad has two sowing windows. The autumn window is far more important than the spring one.

August to September is the prime sowing time. Seeds germinate in 7-14 days at soil temperatures of 10-20C. Plants establish before the cold arrives and produce harvestable rosettes from November onwards. Early August sowings give the biggest plants by winter. Late September sowings still produce a useful crop by January but the rosettes will be smaller.

March to April gives a quick spring and early summer crop. Spring-sown plants grow faster than autumn ones because day length and temperatures are increasing. However, they bolt more readily as soon as warm weather arrives in May or June. Treat spring corn salad as a short-term filler between winter crops and summer salad leaves.

Corn salad will not germinate well in hot soil above 25C. Avoid sowing in June or July. The seeds sit dormant and rot before conditions suit them. If you garden on a south-facing plot with hot summers, stick firmly to the August-September window.

How to sow and grow corn salad

Corn salad is unfussy about soil and growing conditions, but a few details make the difference between a thin scatter of leaves and a proper winter harvest.

Soil and position

Any reasonable garden soil works. Corn salad grows in clay, sand, loam, and even chalky ground. It does not need rich soil or added compost, though a handful of garden compost forked into the surface improves germination on heavy clay soil. Choose a spot in partial shade or full sun. In winter, sun exposure is rarely a problem. In spring, some shade prevents premature bolting.

Sowing method

Sow seed directly where it is to grow. Broadcast scatter over a patch of prepared soil and rake in lightly, or sow in shallow drills 1cm deep and 15cm apart. Thin seedlings to 10cm spacing once they have two true leaves. Corn salad transplants badly, so direct sowing always outperforms starting in modules. Water gently after sowing and keep the soil moist until germination. After that, rainfall alone is usually enough.

Ongoing care

Corn salad needs almost no attention once established. Weed by hand around young plants to prevent competition. Water during prolonged dry spells in September and October while plants are establishing. Once winter arrives, stop watering entirely unless growing under cover. Feed is unnecessary. The plants are too small and short-lived to benefit from fertiliser.

A cold frame or cloche speeds growth during the coldest months but is not essential for survival. Unprotected plants survive perfectly well outdoors. The only advantage of cover is slightly larger leaves and cleaner rosettes free of mud splash.

How to harvest corn salad

Harvest begins 50-70 days after sowing, depending on variety and weather. There are two methods, and the cut-and-come-again approach gives the best total yield.

Whole rosette harvesting: Cut the entire rosette at soil level with scissors or a sharp knife. This works well when you need a large quantity for a meal. Each rosette gives a small handful of leaves, roughly 20-30g. The plant does not regrow after a full cut.

Outer leaf harvesting: Pick individual outer leaves and leave the central growing point intact. The plant pushes out new leaves from the centre over the following weeks. This method gives 3-4 pickings per plant spread over 6-8 weeks. Yields are higher in total but each picking is smaller.

Pick in the morning when leaves are crispest. Handle gently because corn salad leaves bruise and wilt faster than lettuce. Wash in cold water just before eating. Leaves keep for 2-3 days in a sealed bag in the fridge but are best eaten within hours of picking.

How corn salad compares to other winter salad crops

Corn salad is not the only option for winter salad growing. Four crops dominate UK winter salad beds. Here is how they compare across the factors that matter most.

Corn salad wins on cold hardiness and mildness of flavour. Winter purslane (Claytonia perfoliata) is the closest rival, with a similar mild taste and good cold tolerance, though it dislikes heavy clay soil. Land cress suits gardeners who want a peppery, watercress-like leaf. Winter rocket is the least hardy of the four and suffers in prolonged frozen spells.

Growing all four gives a varied winter salad mix from a small area. A single raised bed of 1.2m by 2.4m, divided into four sections, produces enough mixed salad leaves for two people from November through to March.

Does corn salad self-seed?

Yes, and this is one of its greatest strengths. Allow a few plants to flower in April and May. The tiny, pale blue flowers are insignificant but they set seed quickly. Seed drops close to the parent plant, usually within a metre. By late summer, hundreds of seedlings appear wherever last year’s plants flowered.

This self-seeding habit means you can establish a permanent corn salad patch with one packet of seed. After the first year, simply thin the self-sown seedlings to proper spacing and let them grow on. Move excess seedlings to fill gaps elsewhere in the garden. Within two or three years, corn salad becomes a permanent feature of the winter garden, appearing reliably each autumn without any sowing at all.

The only drawback is that self-sown plants appear where they choose, not necessarily where you want them. Treat them like a welcome weed. Pull out seedlings from paths and keep the ones in beds. If tidiness matters more than free plants, deadhead flowers before they set seed and sow fresh each August. The RHS rates corn salad as one of the easiest winter crops for UK growers.

Pests and problems with corn salad

Corn salad has remarkably few problems. Its winter growing season means most pests are dormant, and it suffers from no serious diseases in UK conditions.

Slugs and snails are the only significant threat, mainly to young seedlings in September and October when the weather is still mild and damp. Use the same slug control methods you would for any seedling. Beer traps, copper barriers, or nematode biological controls all work. Once rosettes reach 5cm across, slug damage is rarely severe enough to matter.

Aphids occasionally colonise plants growing under cover in late winter or early spring. A strong jet of water from a spray bottle dislodges them. Plants outdoors in the cold are never affected.

Downy mildew can appear on overcrowded plants in wet, mild winters. Good air circulation and proper spacing of 10cm between plants prevents it entirely. Remove and compost any affected leaves.

No other pest or disease is worth worrying about. Corn salad’s greatest asset, beyond cold hardiness, is this near-total freedom from problems.

Growing corn salad in containers

Corn salad thrives in containers and is one of the best crops for windowsill growing and small-space gardening. Any pot, trough, or window box at least 10cm deep works. Use peat-free multipurpose compost and sow seed thinly across the surface.

On a kitchen windowsill, corn salad produces small but perfectly usable rosettes through winter. South-facing or west-facing windows give enough light. Turn containers every few days to prevent leggy, one-sided growth. Harvest outer leaves to keep plants compact and productive.

For balcony gardeners and those with container vegetable gardens, corn salad deserves a place in every winter planting. Combine it with winter purslane and land cress in a large trough for a ready-made mixed salad bed that crops from November to March with almost no effort.

Using corn salad in the kitchen

Corn salad is best eaten raw. The soft, delicate leaves lose their texture when cooked. Treat it as a premium salad leaf, not a cooking green.

The classic French preparation is salade de mache: whole rosettes dressed simply with vinaigrette, scattered with toasted walnuts and crumbled goat cheese. Sliced beetroot, hard-boiled eggs, and smoked fish are all traditional partners. Corn salad also works as a bed for grilled vegetables, roasted squash, or heritage potatoes served warm.

Because the flavour is so mild, corn salad pairs well with strong ingredients that would overpower lettuce. Blue cheese, anchovies, capers, and vinaigrettes all work. Add it to sandwiches and wraps as a winter alternative to lettuce. Scatter whole rosettes over pizza straight from the oven for a peppery-free garnish.

Frequently asked questions

When should I sow corn salad in the UK?

Sow corn salad from August to September for winter harvests. Spring sowings from March to April produce a quick summer crop but bolt faster in warm weather. Autumn-sown plants are slower growing but much hardier, producing leaves from November right through to March. Scatter seed directly where it is to grow and thin seedlings to 10cm apart.

Does corn salad survive frost?

Yes, corn salad survives temperatures as low as minus 15C. It is the hardiest salad leaf grown in UK gardens. Plants slow down in the coldest weeks of January but resume growth as soon as temperatures rise above 5C. A cloche or cold frame speeds winter growth but is not essential for survival.

What does corn salad taste like?

Corn salad has a mild, nutty flavour with a soft, slightly buttery texture. It lacks the bitterness of rocket and the peppery bite of watercress. The French call it mache and use it in winter salads with beetroot and walnuts. Young leaves are the mildest. Older leaves develop a slightly tangy edge.

Can I grow corn salad in shade?

Yes, corn salad grows well in partial shade. It actually prefers some shade during summer, as full sun and heat cause bolting. In winter, any available light is sufficient because the plants are semi-dormant. North-facing beds and areas under deciduous trees both work. This shade tolerance makes corn salad ideal for spots where lettuce fails.

Does corn salad self-seed?

Yes, corn salad self-seeds freely if you let a few plants flower in spring. The tiny blue flowers appear in April and May. Seed drops within a metre of the parent plant. Seedlings emerge in late summer and grow through winter without any intervention. After the first year, you may never need to buy seed again.

What is the best corn salad variety for the UK?

Vit is the most widely grown and reliable UK variety. It forms compact, dark green rosettes and matures in 50-60 days. D’Etampes has larger, paler leaves and a slightly milder flavour. Jade is slower to bolt in spring warmth. All three perform well in British conditions. Vit is the easiest to find in UK seed catalogues.

How do I harvest corn salad?

Cut entire rosettes at soil level or pick individual outer leaves. Use scissors or a sharp knife. Harvesting outer leaves and leaving the growing point intact allows the plant to regrow for 3-4 additional pickings. Pick in the morning when leaves are crispest. Wash gently, as the soft leaves bruise easily.