How to Grow Claytonia (Winter Purslane): A Hardy Winter Salad

Claytonia is the salad green that fills the hungriest gap in the gardening year — the dark, cold months when almost nothing else is growing. Also known as winter purslane or miner’s lettuce (Claytonia perfoliata, formerly Montia perfoliata), it is a remarkably hardy cool-season annual that crops through autumn, winter, and early spring, shrugging off frosts that would kill lettuce outright. Its tender, succulent, mild leaves — mild enough that even people who dislike peppery greens enjoy them — sit on long stems, and as the plant matures each stem passes through a distinctive round, cupped leaf with a small white flower in the center, which is both pretty and edible. Sow the small seed about a quarter-inch deep in late summer to autumn, thin to around 4–6 inches apart, and pick leaves cut-and-come-again all winter; in cold-frame or polytunnel conditions a single sowing can crop for months. Hardy to well below freezing and reliable across USDA zones 5–9 (and beyond with cover), claytonia tolerates shade, poor soil, and cold better than nearly any salad crop, and it self-seeds freely once established. This guide covers timing your sowing for a winter harvest, spacing, the repeat cut, growing it under cover, and managing its self-seeding.

What Claytonia Is and Why Grow It

Claytonia is a low-growing annual native to the west coast of North America, where it earned the name miner’s lettuce because Gold Rush miners ate it as a fresh source of vitamin C to stave off scurvy. The other common name, winter purslane, points to its succulent, juicy leaves and its season; despite the name it is not closely related to summer purslane, but the comparison to a fleshy, mild green is apt. Botanically it sits in the Montiaceae family, and you will sometimes see it listed under its old genus name Montia.

The reason to grow it is simple: it produces fresh salad leaves through the depths of winter, the time of year when a home gardener has the least to harvest. Where lettuce is killed by the first hard frost, claytonia keeps growing through cold, short, low-light days, providing a steady supply of mild, tender leaves for winter salads. It is unfussy, tolerating shade and poor soil, and its flavor stays sweet and mild rather than turning bitter in cold. For a fuller winter salad bowl, pair it with other cold-hardy leaves — our guide to corn salad (mache) covers a classic partner that crops in exactly the same season and conditions.

When and How to Sow

Timing is the key to a good claytonia crop, and it runs opposite to summer salads. The main sowing window is late summer through autumn — roughly August to October in most temperate regions — so that plants establish in cooling weather and crop through winter into spring. Claytonia actually dislikes summer heat: the seed germinates poorly in warm soil and plants sown in late spring tend to bolt quickly, so it is best treated strictly as an autumn-to-spring crop. You can make a first sowing in late summer for autumn and early-winter cutting, and a second in early autumn for the late-winter and spring crop. A late-winter or very early-spring sowing also works for a spring harvest before warm weather pushes it to flower.

Sow the seed about a quarter-inch deep, either in shallow drills or broadcast across a patch, and keep the soil moist until germination, which takes one to two weeks in cool conditions. Claytonia transplants well, so you can also start it in modules and plant out young clumps — useful for slotting it into a bed or cold frame as summer crops finish. It thrives in the ground, in raised beds, and in containers, making it an easy choice for a sheltered porch or balcony winter salad.

Spacing, Soil, and Site

For full plants, thin seedlings to about 4–6 inches apart; for a baby-leaf patch you cut young and often, grow it denser and simply shear the leaves. Claytonia is genuinely undemanding about soil — it grows in poor, sandy ground as readily as rich beds — though a little compost worked in and steady moisture give bigger, more succulent leaves. Good drainage matters in winter, since waterlogged cold soil invites rot, so a raised bed or free-draining spot is ideal.

One of claytonia’s most useful traits is its tolerance of shade and low light, which is exactly what you have in winter. A position that would be too dim for summer crops suits it fine, and it copes with the short, gray days of midwinter better than most greens. Keep the soil from drying out in any mild, dry spells, and the plants will keep producing tender growth. It needs no feeding to crop well.

Growing Under Cover for a Bigger Winter Crop

Claytonia is hardy enough to survive winter outdoors unprotected in many areas, but giving it some cover transforms the harvest. Under a cold frame, cloche, or low polytunnel, plants stay cleaner, keep actively growing through more of the winter, and are protected from the freeze-thaw and battering rain that can damage exposed leaves. The cover does not need to be heated — claytonia laughs at frost — it simply keeps the worst of the weather off and lifts the temperature just enough to keep growth ticking over on cold days.

In the coldest zones, an unheated greenhouse or polytunnel border is the ideal home for a winter claytonia crop, where it will crop steadily from autumn until it bolts in spring. Even a simple plastic cloche over an outdoor row noticeably improves both yield and leaf quality. This is the same low-effort season-extension that makes other hardy winter salads productive, and claytonia is one of the most reliable crops to put under that cover.

Harvesting Cut-and-Come-Again

You can begin picking claytonia about six to eight weeks after sowing, once plants have a decent rosette of leaves. Harvest cut-and-come-again: either pick individual leaves with their long stems, or shear a baby-leaf patch with scissors an inch or so above the crown, always leaving the central growing point so the plant regrows. Cut this way, claytonia reliably regrows for repeated harvests through the winter; a well-tended patch under cover can give cuttings for many weeks. Pick the younger leaves before the round, cupped “perfoliate” leaves and flowers develop for the most tender salad, though every part — the early arrow-shaped leaves, the round leaves, the stems, and the small white flowers — is edible and mild.

The leaves are best eaten fresh and raw in salads, where their juicy, succulent texture and clean, faintly mineral flavor stand in nicely for lettuce. They can also be wilted briefly like spinach. Harvest in the cool of the day and use them quickly, as the tender leaves do not store long. Picking regularly keeps the plant producing fresh growth and delays the eventual spring bolt.

Self-Seeding, Pests, and Zones

Come spring, warming weather and longer days push claytonia to bolt, sending up flowering stems and finally setting seed before it dies. This is your cue to either pull the plants for the compost or — the easier path — let a few flower and self-seed. Claytonia self-sows enthusiastically, and a patch left to drop seed will reappear on its own the following autumn, often giving you a self-perpetuating winter salad bed with no further sowing. If you do not want volunteers spreading, simply remove the plants before they set seed.

Pests and diseases are mercifully few, which is part of claytonia’s appeal as a winter crop — most pests are dormant in the cold. Slugs and snails are the main nuisance, sheltering under the dense low foliage and grazing leaves, especially under cover; clear debris and pick them off after dark. In persistently wet, poorly drained soil the crown can rot, so prioritize drainage. As for hardiness, claytonia is reliable outdoors in USDA zones 5 through 9, surviving temperatures well below freezing, and with a cloche or cold frame you can crop it successfully in colder zones too. Few vegetables give so much for so little in the deepest, darkest part of the year.