When to plant Bok Choy in Tropical Australia
Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.
Sow bok choy direct from April to September, through the cooler, drier dry season when this fast Asian green performs best in the tropics. Sow seed 5 mm deep and expect quick germination in just 5-10 days. Thin plants to 20-30 cm apart in rows 30-40 cm wide, and you can be harvesting in as little as 45-70 days. That speed makes bok choy one of the most rewarding leafy crops for the dry season around Cairns and Townsville, giving you crisp, mild-flavoured stems and leaves well before the humidity and heat of the wet return.
Sowing calendar — tropical zone
Green months are your sowing window: April to September.
Growing notes
Bok choy is fast, shallow-rooted and thirsty, and in the tropics it belongs squarely in the dry season. Sown from April to September, it grows through mild, low-humidity weather and races to harvest in 45-70 days before bolting pressure builds. Keep the soil consistently moist and rich, as any check to growth turns the leaves tough and bitter.
The defining failure mode here is bolting. Bok choy runs to seed the moment it is stressed by heat, dryness, or transplant shock, which is exactly why wet-season and late-dry sowings so often disappoint around Townsville and Mackay.
- Sow direct rather than transplanting to avoid the check that triggers bolting.
- Water steadily and never let the bed dry out.
- Harvest young and in succession rather than leaving heads to stand.
Pests are the other watch point. Caterpillars and flea beetles pepper the leaves, and slugs and snails shelter in the humid understorey. Grow in an open, sunny bed, clear debris, and check plants often. Because bok choy is so quick, small, frequent sowings through the dry season give a much better result than one large planting. Feed with a balanced liquid fertiliser to keep growth lush and fast, which is the whole secret to tender, sweet stems.
Bok Choy at a glance
| Sowing depth | 5 mm |
|---|---|
| Plant spacing | 20-30 cm |
| Row spacing | 30-40 cm |
| Germination | 5-10 days |
| Days to maturity | 45-70 days |
| Frost tolerance | Hardy |
| Method | Raise Seedlings,Sow Direct |
Common questions
- When can I grow bok choy in the tropics?
- Sow direct through the dry season, from April to September, when cooler, less humid weather suits it. Wet-season heat and humidity cause fast bolting, so the dry months give the most reliable crops.
- Why does my bok choy keep bolting in Cairns?
- Heat, dryness, or transplant shock all trigger bolting in bok choy. Sow direct rather than transplanting, keep the soil consistently moist, and harvest young before stress sets in.
- How long does bok choy take to grow?
- It is fast, ready in 45-70 days from a direct sowing, with germination in just 5-10 days. That speed lets you fit several successions into a single dry season.
- What eats bok choy leaves in a tropical garden?
- Caterpillars, flea beetles, and slugs are the usual culprits, all thriving in warm, humid conditions. Grow in an open sunny bed, clear sheltering debris, and check plants regularly to keep numbers down.
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