Pak choi, often called bok choy elsewhere, is a quick oriental brassica with succulent pale stems and tender leaves. It suits beds, containers and allotments, producing crisp heads in cool weather. In Britain, late-summer sowings usually give the most dependable autumn crop.

When and how to sow

Sow in module trays under cover from March, planting out after hard weather has passed, or sow directly from July to August for autumn harvests. Early spring crops can bolt after cold checks, particularly in northern gardens. Choose sun or light shade and fertile, moisture-retentive soil. Sow thinly, then space full-sized plants 20 to 30 cm apart; baby types can stand closer.

Care

Keep soil evenly moist so growth remains rapid and stems stay tender. Add well-rotted organic matter before sowing, mulch lightly once plants establish, and weed carefully around shallow roots. Use cloches or horticultural fleece for early crops. Succession sowing every few weeks extends picking without producing a glut.

Common problems

Flea beetles can make tiny holes in young leaves, while slugs and cabbage white caterpillars may cause more obvious damage. Cover crops promptly with fine netting or fleece, check beneath leaves regularly and remove pests by hand. Good spacing, steady watering and brassica rotation help reduce disease and bolting.

Harvest

Cut whole heads at soil level when firm and well formed, usually before flower stems develop. Alternatively, pick outer leaves while leaving the centre to regrow as a cut-and-come-again crop. Harvest in the morning for the best crispness and use promptly after picking.

Growing Bok Choy: frequently asked questions

When should I sow bok choy in the UK?

Sow in module trays under cover from March, planting out after hard weather has passed, or sow directly from July to August for autumn harvests.

What are common problems when growing bok choy?

Flea beetles can make tiny holes in young leaves, while slugs and cabbage white caterpillars may cause more obvious damage.

When is bok choy ready to harvest?

Cut whole heads at soil level when firm and well formed, usually before flower stems develop.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 18 Sep 2026.