How to Grow Bok Choy
Brassica rapa var. chinensis
The fastest-growing brassica — crisp, mild, and table-ready in as little as a month.
By the Plants by Zone Editorial Team · Reviewed June 1, 2026
About bok choy
Bok choy is a tender, mild Asian brassica that matures faster than almost any other cool-season vegetable — baby varieties are ready in as little as 25–30 days. Its thick, juicy white stems and glossy dark-green leaves are equally good raw in salads, stir-fried, or braised. It thrives in the cool shoulder seasons when many other crops are still just getting started.
When to plant and harvest bok choy
Timing is relative to your frost dates. Find your USDA zone for exact dates, or browse the month-by-month calendars.
Start seeds indoors
4–6 weeks before last frost (optional)
Transplant outdoors
3–4 weeks before last frost
Direct sow
3–4 weeks before last frost in spring, and again in late summer for fall
Harvest
Spring and fall
How to grow bok choy step by step
- 1
Direct-sow 1/4–1/2 in deep in cool, fertile soil 3–4 weeks before the last frost, or start indoors for an even earlier harvest.
- 2
Thin baby types to 4–6 in apart; full-size bok choy needs 10–12 in — it grows larger than most people expect.
- 3
Keep the soil evenly moist at all times; dry spells make the stems stringy, the leaves bitter, and can trigger bolting.
- 4
Feed lightly with a nitrogen-rich fertilizer about two weeks after thinning to push steady leafy growth.
- 5
For fall crops, count back 45 days from your first frost and sow or transplant so heads mature in cooling weather.
- 6
Harvest baby bok choy as thinnings at any size, or cut the whole head at the base once it reaches the size you want.
Common problems growing bok choy
⚠ Bolting before the head fills
Triggered by heat or lengthening days — grow bok choy strictly in spring and fall, time the sow so it matures in cool weather, and choose bolt-resistant varieties.
⚠ Flea beetles making tiny shot-holes in the leaves
Cover seedlings with floating row cover immediately after sowing; flea beetles are the main pest on young brassicas and damage is heaviest in warm, dry conditions.
⚠ Cabbage worms chewing through leaves
Inspect the undersides of leaves and hand-pick caterpillars; row cover prevents them if kept in place from sowing.
⚠ Bitter or tough stems and leaves
Almost always heat stress or water stress — grow in cool weather, keep soil consistently moist, and harvest promptly once heads reach size.
✓ Good companions for bok choy
✗ Keep away from
🧺 Harvesting bok choy
Harvest bok choy at any stage: snip individual outer leaves for a cut-and-come-again supply, or wait and cut the whole head at the base once it reaches a size you like. Baby bok choy is best at 4–6 inches; full-size heads can reach a foot or more. Morning is the ideal harvest time when stems are fully turgid and crisp. Refrigerate immediately and use within a week.
Bok Choy: frequently asked questions
When should you plant bok choy?＋
In most regions you start seeds indoors 4–6 weeks before last frost (optional), then transplant 3–4 weeks before last frost — or direct sow 3–4 weeks before last frost in spring, and again in late summer for fall. Timing is relative to your last frost, so find your USDA hardiness zone for the exact planting dates where you live.
Can I eat bok choy raw?＋
Yes — tender inner leaves and baby bok choy are excellent raw in salads, with a crisp texture and a mild, faintly mustardy flavor. Larger outer leaves and mature heads are best lightly cooked in a stir-fry or braise.
How do I stop bok choy from bolting?＋
Timing is everything: sow early in spring so heads mature before summer heat arrives, or sow in late summer for a fall harvest. Heat and long days are the primary bolt triggers, so keeping bok choy in the cool shoulder seasons is the most reliable fix.
Sources & review
Written and maintained by the Plants by Zone Editorial Team. Planting times are based on USDA hardiness zones and NOAA frost-date normals, with care guidance drawn from Cooperative Extension sources. Last reviewed June 1, 2026.
USDA Plant Hardiness Zone MapNOAA U.S. climate normalsCooperative Extension
Grow bok choy in your zone
See exactly when to plant and what else to grow alongside bok choy, tailored to your USDA hardiness zone.
When to plant bok choy by zone:
