Bok choy is the quick, crisp brassica of the cool season — tender white stems and mild green leaves in about seven weeks, and the one crop in this batch that prefers a little shade. This guide answers "when to plant bok choy zone 11" directly: when to sow, how to start it, what soil and spacing it needs, how to water and feed it, which neighbours help, which pests to watch, and when to harvest. Zone 11 is frost-free, with average winter lows of 40 to 50°F, so there is no last or first frost date to plan around — here you plant by heat and by the wet and dry seasons, not by frost. See the full planting calendar for the whole year, and check your local extension service for advice specific to your area.
Bok Choy at a glance in Zone 11
All figures below are broad published ranges from standard horticultural references, not exact figures for any variety or garden — they vary by variety, climate and soil. Use them to compare crops and to plan, not as promises.
| Detail | Bok Choy |
|---|---|
| Days to germinate | 7–10 |
| Days to maturity | 45–60 |
| Spacing (inches) | 8–12 |
| Soil pH | 6.0–7.5 |
| Sun | part shade |
| Sowing method | both |
| Cold tolerance | hardy |
| Water needs | moderate |
When to plant bok choy in Zone 11
Sow bok choy in the coolest months, roughly late autumn through winter, when it can form tight, crisp heads before heat arrives. In Zone 11, bok choy is a cool-season crop that bolts fast in warm weather: the plant runs to flower, the stems turn tough, and the leaves go bitter. With a published maturity range of 45–60 days, a cool-season sowing can be harvested well before the warm season. Because the zone is frost-free, with winter lows of 40 to 50°F, there is no frost date to plan around — sow by temperature instead, and check your local extension service for the best window in your area. Give bok choy afternoon shade in the tropics; it is the only crop in this group that prefers part shade. Our December in Zone 11 guide shows what else to sow and harvest that month in Zone 11.
Starting bok choy
Sow bok choy directly or start it in trays — both work, and the published germination range is 7–10 days. Starting indoors protects young seedlings from slugs and flea beetles, which are the worst pests of baby bok choy; transplant when seedlings have three or four true leaves, after hardening them off. Space plants as shown in the table below — bok choy needs room for air to move, or the leaves rot in humid weather. Sow seed about a quarter inch deep and keep the bed moist until seedlings are up. The seed-starting calculator helps time your sowing for the cool season.
Soil, spacing and sun
Bok choy wants rich, moisture-holding soil with a soil pH of 6.0–7.5. Dig in plenty of compost before sowing; bok choy is a fast, hungry crop, and compost also helps sandy tropical soils hold water. It needs good drainage — waterlogged soil rots the stems — so raised beds or well-drained ground are best in the wet season. Mulch lightly to keep the soil cool and moist, but keep mulch away from the stems. In containers, a pot 8 inches deep with good mix gives a fast crop, and pots can be moved into shade on hot afternoons.
Watering and feeding
Bok choy needs moderate, steady water — never a drought followed by a flood. Water at the base in the morning so leaves dry before night, which keeps disease down in humid air. In the cool months a deep watering every few days is enough; in a hot spell, check the soil daily, since stressed bok choy bolts. Mulch helps enormously. Feed lightly with compost tea once or twice while plants are growing, but do not overfeed — too much nitrogen makes soft, pest-prone leaves that rot in the centre.
Companion planting
Good companions for bok choy are marigolds, basil, onions and lettuce. Onions help deter flea beetles, marigolds at the bed edge discourage soil pests, and lettuce can be grown between young bok choy plants as a catch crop. Basil attracts beneficial insects. Avoid planting bok choy next to other brassicas such as cabbage, broccoli or kale, since they share pests, and rotate brassicas to fresh ground each year to break the cycle of flea beetles and clubroot. For a cooler-climate comparison, see how the same crop is timed in Zone 9.
Pests and problems
Watch for cabbage worms, aphids, flea beetles and slugs. Flea beetles are the biggest threat to young bok choy: they riddle leaves with tiny holes and can kill seedlings. Cover new rows with fine insect mesh until plants are established, and keep the soil moist. Cabbage worms chew holes in the leaves — check the undersides weekly and pick them off by hand. Aphids cluster in the heart of the plant and can be washed out with water. Slugs love bok choy's tender stems in humid weather — check at dusk and keep the bed tidy.
Harvest and storage
Cut bok choy when the heads are firm and full, usually within the published maturity range of 45–60 days from sowing. Cut the whole head at soil level with a sharp knife, or pick outer leaves first and let the centre keep growing for a longer harvest. Do not leave heads in the ground once they are ready — they bolt quickly in warm weather and the stems turn woody. Harvest in the morning, when leaves are crisp, and use the same day if you can. Bok choy keeps for about a week in the fridge in a bag, and it is best lightly cooked in stir-fries and soups. If you are planning the rest of the bed, our guide to Arugula in Zone 11 covers another crop from the same Zone 11 season.
Frequently asked questions
When should I plant bok choy in Zone 11?
In the coolest months, roughly late autumn through winter. It needs 45–60 cool days — heat makes it bolt and turn bitter.
Does bok choy need full sun in Zone 11?
No — it prefers part shade here, unlike most vegetables. Morning sun with afternoon shade keeps it cool and slows bolting in a tropical garden.
Why did my bok choy bolt?
Warm weather, dry soil, or transplant shock. Sow in the cool season, water steadily, mulch, give afternoon shade, and harvest as soon as heads are full.
How do I stop flea beetles on bok choy?
Cover young plants with fine insect mesh until they are established, keep the soil moist, and plant onions nearby. Pick off any cabbage worms by hand when you see them.