Joi Choi
A reliable green pak choi with good bolting tolerance and crisp stems.
Brassica rapa subsp. chinensis

A quick-growing brassica for the UK garden. It likes cool, moist conditions. Sow in spring and again in late summer and autumn. Midsummer sowings of full heads often bolt, so keep those for baby leaves and do not let the row dry out.
30 cm · Full Sun · High Water
Calibrated to Nottingham · last frost ≈ 20 Apr
| Activity | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow outdoors | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No |
| Harvest | No | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No |
What to do through the growing season
01
Sow thinly from 20th April - 23rd September in shallow drills, then again every 21 days for a steady supply. Cover lightly with fine soil and keep the row moist while the seed germinates.
02
When seedlings have a couple of true leaves, thin to one plant every . Use the thinnings in the kitchen if they are healthy, and keep the strongest plants going.
03
From 27th April, cover the row with insect-proof mesh or fleece before the seedlings emerge, to keep flea beetle off. Keep checking for slugs and snails on the young leaves. Use barriers, hand-picking, or pellets where you need them, and keep the bed tidy.
04
From 27th April, keep the soil evenly moist so plants grow away quickly and are less likely to bolt in warm spells. Water at the base, not over the leaves, and give a good soak when the top of the soil starts to dry.
05
Start picking from 20th May once plants are firm enough to crop. Take outer leaves for cut-and-come-again, or cut whole plants at soil level when they reach eating size.
Tap a plant to see why it works (or doesn't) with Pak Choi.
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.
Popular varieties of Pak Choi to consider
A reliable green pak choi with good bolting tolerance and crisp stems.
A compact mini pak choi that suits smaller gardens and containers.
A standard green-stemmed type with quick growth and a mild flavour.
A productive hybrid pak choi grown for uniform heads and steady cropping.