
Brassica rapa subsp. chinensis
A quick-growing Asian brassica for the UK garden. It does best in cool, moist conditions, with regular sowings from late spring through summer and a steady supply of water to slow bolting.
Step-by-step instructions for growing Pak Choi
Sow thinly around 11th April - 9th August in shallow drills, then repeat every 21 days for a steady supply. Cover lightly with fine soil and keep the row moist while the seed germinates.
When seedlings have a couple of true leaves, thin them to one plant every . Use the thinnings in the kitchen if they are healthy, and keep the strongest plants growing on.
Check plants from 17th June for slug and snail damage, especially on soft young leaves. Use barriers, hand-picking, or pellets where needed, and keep the area tidy so pests have fewer hiding places.
From 17th June, keep the soil evenly moist so plants grow away quickly and are less likely to bolt in warm spells. Water at the base rather than over the leaves, and give a good soak whenever the top of the soil starts to dry.
Start picking from 10th July once plants are firm enough to crop. Take outer leaves for cut-and-come-again harvests, 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.