When to plant Cress in Tropical Australia

Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.

Sow cress direct year round, in any month from January to December, because it matures so fast it beats the tropics at their own game. Scatter seed shallowly at about 4 mm deep, and it germinates in 6–12 days and is ready to cut in just 10–14 days. Space or thin plants to around 15 cm, in rows 10–15 cm apart, though most gardeners in Darwin and Cairns simply broadcast it thickly and cut it young. Keep the bed constantly moist and lightly shaded in the hottest months. Its speed makes it one of the few salad greens that fits any part of the tropical calendar.

Sowing calendar — tropical zone

Green months are your sowing window: January to December.

Growing notes

Cress is a rare tropical all-rounder because it is harvested so young that heat and daylength barely matter. You can sow every month, but in the wet season and through the hottest weeks around Townsville and Cairns you will get the best results from a shaded spot and frequent small sowings rather than one big bed.

The usual failure mode is drying out. At 4 mm deep the seed and seedlings sit right at the surface, and a single missed watering on a hot afternoon can scorch a whole tray or row. The fix is shallow, steady moisture, ideally a misting once or twice a day in peak heat, and afternoon shade so the surface never bakes.

Because cress is cut at 10–14 days, treat it as a cut-and-come-again crop and sow a fresh pinch every week for a continuous supply. Broadcast thickly for a mat of microgreen-style leaves, or thin to 15 cm if you want larger plants. In the humid wet season, keep airflow up and avoid overcrowding, as damp, still conditions invite damping-off in the seedling stage. Harvest with scissors just above soil level and it will often flush a second cut.

Cress at a glance

Common questions

Can I grow cress all year in the tropics?

Yes. Cress matures in 10–14 days, so it sits outside the usual wet-versus-dry constraints and can be sown in any month. In the hottest weeks, use a shaded bed and mist often to stop the shallow seedlings drying out.

How fast does cress grow?

Very fast. Seed germinates in 6–12 days and the crop is ready to cut in 10–14 days. That speed is why it works year round in Darwin and Cairns while slower salad greens struggle.

Why did my cress seedlings collapse?

That is usually damping-off from damp, still, humid conditions, common in the tropical wet. Sow more thinly, improve airflow, and avoid keeping the surface waterlogged. A lighter, well-drained mix and morning sun help the seedlings stay firm.

How do I sow cress for a steady supply?

Sow a small pinch every week rather than one large bed. At about 4 mm deep and cut young, each sowing lasts only days, so successions keep fresh leaves coming without a glut.

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