(Claytonia perfoliata) AKA Miner’s Lettuce or Winter Purslane. Heart shaped succulent leaves with mild flavour. One of the hardiest of greens, grows well right through the winter in a cold frame or unheated greenhouse- even under the snow. A smash hit in early spring salads! They germinate only in cool weather, and will sometimes sit dormant in the soil until conditions are just right.