How to Grow Pak Choi in the UK

Pak choi is one of the fastest crops you can put on a UK plot — ready in as little as five weeks, happy in a container, and productive right through summer if you can keep it from bolting. Here's how to sow, grow, protect and harvest it.

Last updated 18 July 2026

Pak choi (Brassica rapa subsp. chinensis), also called bok choy or Chinese cabbage, is a loose-headed Asian brassica grown for its crisp white stems and glossy green leaves. It's one of the quickest vegetables you can grow from seed — some varieties are ready to cut in as little as five to six weeks — which makes it an ideal catch crop for filling gaps between slower vegetables, or a reliable stand-alone crop for a container or small bed. The main challenge for UK growers isn't getting it to grow; it's stopping it from bolting before you get a harvest.

What Is Pak Choi and Why Grow It

Unlike cabbage, pak choi doesn't form a tight, dense head — it grows as a loose rosette of spoon-shaped leaves on thick, succulent white or pale green stems, ready to harvest whole or leaf-by-leaf. It's stir-fried, steamed or eaten raw, with a mild, slightly peppery flavour similar to a cross between cabbage and spinach. Because it matures so quickly and takes up relatively little space, it suits raised beds, large containers and even grow bags, making it a good option for smaller UK gardens and allotment plots where slower brassicas would tie up ground for months.

Sowing Pak Choi in the UK

Pak choi can be sown from April through to August, either direct into well-prepared soil or into modules for transplanting once seedlings have two or three true leaves. Sow thinly, around 1cm deep, and expect germination within 4–7 days in warm soil. Because early, cold-triggered sowings are the single biggest cause of failure with this crop, many UK growers deliberately hold off direct sowing outdoors until late May or June, once the risk of a cold snap has passed.

Thin or space plants to around 20–25cm apart. Tighter spacing works if you intend to harvest young as "baby" pak choi within three to four weeks, rather than growing full-sized heads.

Regional Timing: South vs North

In the milder south, an April sowing under cloches or fleece can work if you're prepared to keep it covered through any late cold spells, but sowing from late May onwards is more reliable and less fiddly. Further north and in Scotland, where a cold snap can arrive later in spring and soil stays cooler for longer, it's safer to wait until June for outdoor sowings. Whichever region you're in, avoid sowing during the height of a hot, dry spell too — heat stress at seedling stage is the other common bolting trigger, so aim for that settled middle ground between "still cold" and "baking hot."

Watering and Feeding

Consistent moisture is more important for pak choi than for most vegetables, because any check in growth from drying out — like a check from cold — tends to trigger bolting rather than just slowing the plant down. Water regularly and evenly, especially in dry spells, and mulch around plants to help the soil hold moisture for longer. Building moisture-retentive soil before you sow makes this much easier to manage; our guide to best soil for growing vegetables in the UK covers how to get the structure right. A light, balanced liquid feed every couple of weeks once plants are established will keep growth steady, but avoid heavy nitrogen feeds, which push soft, pest-attracting leaf growth.

Protecting Pak Choi from Pests

As a brassica, pak choi is vulnerable to the same pests that trouble cabbage and kale: cabbage white butterfly caterpillars, flea beetle on young seedlings (which rifle small round holes through the leaves), and slugs, which find the tender young stems particularly appealing. Because pak choi matures so quickly, netting from the day of sowing or transplanting is the most effective single step — see our full guide to protecting brassicas from cabbage white butterfly for mesh sizes and timing. Companion planting can also help reduce pest pressure without resorting to sprays; our UK companion planting guide covers pairings that work well alongside brassicas. For a broader view of what else can go wrong in a UK vegetable bed, see our garden problems, pests and diseases hub.

Harvesting Pak Choi

Pak choi can be harvested two ways. For baby leaves, cut the whole plant three to four weeks after sowing, once it's a handful in size — this is the quickest route to a crop and the safest against bolting. For full-sized heads, wait five to eight weeks until the rosette is 15–20cm across, then cut the whole plant just above soil level with a sharp knife. You can also harvest a few outer leaves at a time from an established plant, leaving the centre to keep growing, which extends your harvest window from a single sowing.

Storing and Using Pak Choi

Pak choi doesn't store for long once cut — it keeps for around three to five days in the fridge salad drawer, ideally in a loose bag to retain moisture without going slimy. It doesn't lend itself to long-term storage the way root crops or squash do, so it's best treated as a cut-and-use-fresh crop; successional sowing every couple of weeks through the season is a more reliable way to keep a steady supply than trying to store a single large harvest. It cooks in minutes — stir-fried whole or halved, steamed, or added raw to salads for a peppery crunch.