How to Grow Corn Salad (Mache): A Winter Salad Guide

Corn salad, known across Europe as mache, lamb’s lettuce, or doucette, is the salad green that keeps producing when everything else in the garden has surrendered to frost. It forms low rosettes of small, spoon-shaped leaves with a mild, nutty, almost buttery flavor, and it shrugs off temperatures that turn lettuce to mush. If you have ever wanted fresh salad from your own beds in December, January, and February, this unassuming little plant is the most reliable way to get it. It is hardy down to roughly 5°F (USDA zones 5 and up will overwinter it outdoors), germinates in cold soil, asks almost nothing of you, and self-seeds so generously that a single autumn sowing can return year after year.

What Is Corn Salad (Mache)?

Corn salad (Valerianella locusta) is a small annual in the valerian family, native to Europe, North Africa, and western Asia. The “corn” in the name has nothing to do with maize; it refers to “corn” in the old sense of grain fields, where the plant grew wild as a weed between cereal crops. Farmers and foragers learned to eat the rosettes that appeared in autumn-sown grain, and it became a cold-weather staple long before greenhouses existed.

The plant grows as a tight rosette of rounded, dark-green leaves rarely more than 4–6 inches across. Flavor is its selling point: mild, slightly sweet, and nutty, with none of the bitterness that creeps into overwintered chicories or the sharpness of mustards. It pairs beautifully with beets, walnuts, citrus, and soft cheeses, and because the leaves are small and tender, it needs no tearing or stemming. Two broad types are sold: large-seeded Dutch varieties such as ‘Dutch Broad Leaf’, which grow faster and larger but are slightly less cold-hardy, and small-seeded French types such as ‘Verte de Cambrai’ and ‘Vit’, which are smaller, more compact, and the toughest in deep cold.

When to Sow Corn Salad

Timing is the single most important thing to get right, because corn salad is fundamentally a crop of cool, shortening days. The main window is late summer to mid-autumn — roughly August through October in most temperate zones. Seed sown in this window germinates as the soil cools, bulks up through autumn, and then either crops through winter or sits dormant in hard cold and surges back at the first warmth of late winter.

You can also sow in very early spring (February to March) for a quick crop before the weather warms, but spring sowings race toward bolting and give you a shorter harvest window. Avoid sowing in late spring and summer altogether: in long days and heat above about 75°F (24°C), germination is erratic and any plants that do emerge bolt to flower almost immediately, producing a thin straggly stem instead of a usable rosette. In short, treat corn salad like a mirror image of lettuce — where lettuce wants spring, mache wants autumn.

For a continuous supply, sow a short row every two to three weeks from late August into October. Each successive sowing matures a little later, so a few staggered bands keep tender rosettes coming right across the dark months. If you grow under cover, you can stretch sowing into early November in milder regions (zones 7–8) and still get a late-winter cut.

Soil and Site

Corn salad is admirably unfussy, but a little preparation pays off. It does best in moist, fertile, well-drained soil with plenty of organic matter, the kind of ground that grew a heavy summer crop and has been topped with compost. A neutral to slightly alkaline pH of 6.5–7.5 suits it. It does not need rich nitrogen feeding; in fact, overly lush soil produces soft leaves that are more prone to rot in damp winter conditions.

For autumn and winter crops, choose an open, sunny spot. The low winter sun is weak, and shading from walls, fences, or evergreens will slow growth to a crawl. In spring sowings, light afternoon shade can actually help by delaying bolting. Corn salad is an ideal catch crop and intercrop: slot it into the gaps left by lifted onions, garlic, or summer beans, or broadcast it between rows of slower brassicas. Because the rosettes are tiny and shallow-rooted, it competes well in those in-between spaces.

How to Sow

Direct Sowing

Corn salad is best sown directly where it is to grow — it has a small taproot and resents transplanting once past the seedling stage. Rake the bed to a fine tilth, water the drill if the soil is dry, and sow seed about ¼ inch (5–6 mm) deep. You can sow in shallow rows 6 inches apart or simply broadcast the seed thinly across a patch and rake it in lightly. Broadcasting suits the cut-and-come-again approach; rows make weeding and harvesting whole rosettes easier.

Be patient with germination. In warm late-summer soil seedlings can appear in a week, but as temperatures drop, germination slows to two or even three weeks, and the seed can sit looking inert before it suddenly emerges. Keep the surface consistently moist during this period; a dried-out drill is the most common reason for a patchy stand. Old seed germinates poorly, so buy fresh each year or test a pinch on damp paper towel before committing a whole bed.

Spacing and Thinning

Once seedlings have two or three true leaves, thin them to 3–4 inches apart in each direction if you want full, harvestable rosettes. Thinnings are edible — toss them straight into a salad. If you are growing purely as a cut-and-come-again baby leaf, you can leave plants denser, around 1–2 inches apart, and simply shear the tops. For overwintering, slightly wider spacing improves airflow and reduces the gray-mold problems that crowded, damp rosettes are prone to.

Caring for Corn Salad

Day-to-day care is minimal. Keep the soil moist but never waterlogged; in autumn this usually means letting the rain do the work, with supplemental watering only in a dry early-autumn spell. Avoid wetting the foliage late in the day during winter, as cold standing moisture in the crowns invites rot. The plants need no feeding if grown in decent soil that held a previous crop.

Weeding matters more than feeding. Corn salad is small and slow, and vigorous winter weeds like chickweed and bittercress will smother it if you let them. Hand-weed gently between the rosettes, taking care not to disturb the shallow roots. A thin scatter of fine mulch or a light covering of fleece on the coldest nights keeps the leaves clean and harvestable. Slugs and snails are the main pests, especially under cover or mulch, so check regularly and trap or remove them, since a handful of slugs can shred a small stand overnight. For a fuller rundown of cold-season crops that pair with mache, see our guide on how to overwinter vegetables in the garden.

Winter Protection

Corn salad is one of the hardiest salad greens you can grow, surviving unprotected to about 5°F (-15°C) and bouncing back from being frozen solid. It does not need protection to live through winter in most of the US and UK, but cover dramatically improves the quality and availability of the harvest. Under a cloche, cold frame, or low tunnel, the leaves stay cleaner, dry out faster between rains, and keep growing on milder days, so you can cut all winter instead of waiting for a thaw.

A simple floating row cover or fleece draped over hoops is enough; you are managing wet and wind as much as cold. If you garden in a colder zone (4 or below) or want pristine leaves, a cold frame is the gold standard. Our companion piece on using a cold frame to extend the season walks through exactly how to manage ventilation so overwintered greens don’t cook on sunny days or rot in still, humid air.

Harvesting

You can begin harvesting roughly 8–12 weeks after an autumn sowing, depending on how warm the autumn stays. There are two approaches. The traditional method is to lift or cut entire rosettes at the base once they reach a usable size — about the diameter of a small saucer. Whole rosettes look attractive in the bowl and keep the mild flavor intact. Alternatively, treat it as cut-and-come-again: shear the leaves an inch above the crown and let the plant regrow, which it does slowly but reliably through a mild winter, giving two or three cuts from one sowing.

Harvest in the cool of the morning when leaves are crisp, and wash gently — the rosettes trap grit and the leaves bruise easily. Use it fresh; mache wilts faster than tougher greens and does not store well, lasting only a few days in the refrigerator. Stop cutting once the plants begin to send up flower stalks in spring, as the leaves turn tougher and slightly bitter then. That said, those bolting plants are exactly what you want to keep for the next step.

Self-Seeding and Saving Seed

One of corn salad’s best traits is how readily it perpetuates itself. Leave a few of the strongest plants unharvested in spring and let them bolt; they produce sprays of tiny pale flowers followed by small seeds. Allow these to ripen and drop, and you will get a flush of self-sown volunteers the following autumn exactly when you want them — nature’s own succession sowing. Many gardeners never deliberately sow mache after the first year; they simply let a corner go to seed and rake the volunteers into rows.

To save seed deliberately, let the seed heads dry on the plant, then cut them on a dry day and rub the seed free over a sheet or sieve. Store it cool and dry in a labeled envelope. Remember that corn salad seed loses viability quickly — within a year or two — so save fresh annually rather than hoarding old packets. If you grow heirloom open-pollinated types and you are interested in the broader trade-offs of seed-saving, our overview of hybrid versus heirloom seeds explains why open-pollinated greens like mache are so easy to perpetuate at home.

Common Problems

Patchy germination is almost always down to dry soil, warm soil, or old seed. Keep the drill moist, sow once temperatures have eased below the mid-70s°F, and use fresh seed. Premature bolting signals a sowing made too late in spring or too early when days were still long and warm — shift your timing toward autumn. Gray mold (botrytis) appears as fuzzy decay on crowded, damp rosettes; thin for airflow, avoid overhead watering in winter, and remove affected plants promptly. Slug damage is the other reliable nuisance; trap, hand-pick, or use barriers, especially under cover where slugs shelter happily. Get the timing right and these issues mostly disappear, leaving you with one of the lowest-effort, most rewarding crops in the cold-season garden.