Sea Kale

Coastal origins

Sea kale grows wild on the shingle beaches and sea cliffs of Britain and Atlantic Europe, where its broad, glaucous blue-green leaves and clouds of small white flowers are a striking feature of coastal vegetable communities. Wild plants were harvested from beaches — the young shoots naturally blanched by shingle — as a spring vegetable long before cultivation began. The wild plant was protected in Britain by the 19th century as collecting pressure threatened coastal populations.

Forcing and blanching

The culinary value of sea kale lies entirely in the forced, blanched shoots. Left to grow in the open, the leaves are tough, dark, and strongly bitter. Covered with terracotta forcing pots or upturned buckets from late winter onwards, the new growth is deprived of light and becomes etiolated — pale, tender, with concentrated sugars and reduced bitterness. Blanching typically takes four to six weeks. The resulting spears are ivory-white and have a mild, nutty, slightly asparagus-like flavour.

Victorian fashion and decline

Sea kale was enormously fashionable in the late 18th and early 19th centuries. It appeared on the tables of great houses, was grown in elaborate kitchen garden arrangements, and was described by Regency food writers as one of the finest spring vegetables. Thomas Jefferson grew it at Monticello. Its decline was rapid in the 20th century — the labour involved in forcing, the long establishment period (plants take 3 years to reach full production), and the arrival of imported asparagus combined to make it economically unviable commercially.

Revival

Sea kale has been championed by chefs including Fergus Henderson, who serves it at St John in London, and by kitchen gardeners seeking heritage vegetables with unusual flavours. It is now available from specialist growers and at some farmers’ markets in spring. Growing from root cuttings (thongs) allows faster establishment than seed.