When to plant Cress in Arid Australia

Arid zone — applies to Alice Springs, Mildura, Broken Hill, Kalgoorlie, Port Augusta and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Tropical.

Sow cress direct from March to September, spread across the cooler months when desert soil stays workable and evenly damp. This is one of the fastest crops you can grow: seed germinates in 6-12 days and leaves are ready to cut in just 10-14 days, so little-and-often sowings keep a steady supply on hand. Sow shallowly at 4 mm deep, spacing plants around 15 cm with rows 10-15 cm apart, or simply broadcast it thickly for a cut-and-come-again mat. In arid gardens around Alice Springs and Port Augusta, cress thrives in autumn and winter but hates the summer.

Sowing calendar — arid zone

Green months are your sowing window: March to September.

Growing notes

Cress is quick and forgiving, but in the desert the make-or-break factor is heat. Once daytime temperatures climb into the thirties, it bolts to seed within days and the leaves turn unpleasantly sharp, so keep all your sowings inside the March to September window and avoid tempting warm spells at either end.

Moisture is the other key. Cress germinates and grows fast only in consistently damp soil, and the dry inland air can crisp a shallow sowing in an afternoon. Water lightly but often, and a thin scatter of mulch or a shade cloth over young beds helps hold moisture on hot autumn days in Mildura or Broken Hill.

Failure mode: patchy, stringy growth that bolts almost immediately usually means the bed dried out or the weather turned warm. The fix is to sow into a shaded, well-watered position and treat cress as a cool-season sprinter, resowing a small patch every one to two weeks rather than trying to hold one big planting.

Because it matures so fast, cress is ideal for filling gaps between slower winter crops or growing on a windowsill tray when the beds are busy.

Cress at a glance

Common questions

How quickly does cress grow in the desert?

Very quickly. In the cool months it germinates in 6-12 days and is ready to cut in about 10-14 days, making it one of the fastest crops for arid gardens. Sow small batches often for a continuous supply.

Can I grow cress through summer in Alice Springs?

No. Summer heat makes cress bolt and turn bitter almost immediately. Keep sowings to the March to September window when soil and air stay cool enough for tender leaves.

Why does my cress bolt so fast?

Bolting is triggered by heat and dryness. Sow only in the cooler months, keep the soil consistently damp, and give young plants some shade on warm days to slow them down.

Do I need to space cress plants?

You can space them around 15 cm for larger plants, but cress is usually broadcast thickly and cut young as a cut-and-come-again crop. Either approach works well in a cool-season desert bed.

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