Brussels Sprouts
Brassica oleracea gemmifera
A tall, single-stemmed brassica grown for the tight leafy buds that form in a spiral up the stem, each one a miniature cabbage of roughly 2–4 cm across. The stem is topped by a loose rosette of blue-green leaves, the sprout tops, which are eaten as greens. Flavour is cabbagey and faintly sulphurous, sweetening after frost. A garden and field crop rather than a wild find, though abandoned plants persist around allotments.
A cultivated crop of allotments, kitchen gardens and open field beds, wanting firm, well-drained ground and a sunny, open site; the tall stems are usually staked or earthed up on exposed plots. Not naturalised in Britain or Ireland, but self-sown and abandoned plants linger on allotment edges and tipped soil.
No significant toxicity. Usually cooked, though finely shredded raw sprouts are eaten in salads; large raw quantities are harshly bitter and can cause bloating. Brassicas are high in vitamin K and contain goitrogens, so anyone whose medication or thyroid condition depends on steady intake may want to check. Wash well, as this crop is commonly sprayed and slug-treated.
Always use more than one reference to confirm a plant. You are responsible for what you choose to forage.
Growth habit
A single thick, upright stem 60–100 cm tall with buds crowded in the leaf axils all the way up. Cabbage and cauliflower put everything into one terminal head; a stem studded with dozens of small heads is diagnostic.
Sprouts
Each bud is a tight ball of overlapping, blue-green leaves, firm when squeezed. Loose, opening buds mean the plant has blown, usually after mild weather — still edible but coarse and strong-tasting.
Sprout tops
The stem ends in a loose, open rosette of large leaves. Cutting these early stops the plant feeding the sprouts below, so they are taken at the end of the season and cooked like spring greens.
Frost response
Starch converts to sugar in cold weather, so sprouts picked after a frost taste sweeter and less sulphurous than the same plant picked in a warm October.
Second-year flowers
Plants left in the ground bolt in their second spring into tall stalks of four-petalled yellow flowers, the standard cabbage-family cross. At that point the sprouts have gone woody and bitter.
Updated 2026-08-08T11:01:33.104Z · Part of the shared Foragers Log catalogue · Vegetable