What to Plant in Wet Season in Darwin

Tropical crops that thrive in monsoon conditions from November to April

Darwin's wet season is intense. From November to April, the city receives around 1,700mm of rain. January and February each average over 400mm. Humidity stays above 80% for months, and overnight temperatures rarely drop below 25 degrees. Most standard vegetables give up immediately in these conditions.

A handful of tropical crops grow brilliantly through the monsoon. These plants evolved in wet tropical climates and produce food when everything else fails. With the right crop selection, your Darwin garden can stay productive year-round.

Sweet Potato

Sweet potato is the foundation crop for wet season gardening in Darwin. Plant slips (vine cuttings) in October or November as the build-up intensifies. The vines thrive in heat and humidity, spreading rapidly to cover bare soil and suppress weeds.

Mound soil into rows 20-30 centimetres high for drainage. Insert slips 30 centimetres apart along the mounds. The vines grow fast in Darwin's wet season warmth, and tubers develop underground over 4-5 months. Harvest from March to May as the dry season begins.

Varieties available from Darwin nurseries and garden centres include Beauregard (orange flesh, fast maturing, widely available), Northern Star (white flesh, very productive in Top End soils), and T65 (developed for tropical conditions by CSIRO). Sweet potato leaf tips are edible and nutritious. Harvest the growing tips regularly for stir-fries and salads.

Kangkong (Water Spinach)

Kangkong is the leafy green for Darwin's wet season. It grows in waterlogged conditions, handles extreme heat, and produces continuously for months. Sow seeds or plant stem cuttings in October or November. Harvest young stems and leaves from 6 weeks onwards. Cut stems back to 10 centimetres and they regrow rapidly.

Grow kangkong in a large pot sitting in a deep saucer of water, or plant it in a consistently wet section of the garden. It spreads vigorously, so containers are a good choice for small gardens. The hollow stems and tender leaves are a staple in Southeast Asian cooking, perfect in stir-fries, soups, and sambal dishes.

Snake Beans

Snake beans (yard-long beans) produce heavily through Darwin's wet season. Sow seeds directly in November or December. The vines climb quickly to 3 metres or more, so provide a sturdy trellis. Harvest beans at 30-40 centimetres for the best texture. Pick every 2-3 days to keep plants producing new pods.

The variety Green Noodle is the standard for Top End gardens. Purple-podded varieties add visual interest and taste the same when cooked. Snake beans handle the humidity and rain far better than common green beans, which rot on the vine during the monsoon.

Tropical Greens

Ceylon Spinach (Malabar Spinach)

A vigorous climbing vine with thick, glossy, dark green leaves. Ceylon spinach grows year-round in Darwin but is at its most productive during the wet season. Plant seeds or cuttings and provide a trellis. The leaves have a slightly mucilaginous texture that works well in soups, curries, and stir-fries. Pick individual leaves as needed.

Okinawan Spinach

A low-growing groundcover with striking green-and-purple leaves. Okinawan spinach produces steadily through the wettest months with virtually no care. Propagate from stem cuttings. The mild-flavoured leaves can be eaten raw in salads or lightly cooked. An excellent edible groundcover for shady spots.

Amaranth

Tropical amaranth grows fast in Darwin's wet season. Sow seeds directly and harvest young leaves from 4-6 weeks. The leaves are high in iron and calcium. Cut the plant at 30 centimetres and it regrows for a second harvest. Red-leaved varieties are popular in Asian cooking.

Okra, Luffa, and Eggplant

Okra loves Darwin's heat and humidity. Sow seeds in October or November after soaking for 12-24 hours. Plants grow 1.5-2 metres tall and begin producing pods from 8 weeks. Harvest every 2 days when pods are 8-10 centimetres long. Clemson Spineless is the standard variety.

Luffa grows vigorously on a trellis during the wet season. Harvest young fruit (15-20 centimetres) for cooking, or leave fruit to mature on the vine for use as a natural sponge. A single plant on a strong trellis can produce 20 or more fruit during the monsoon.

Eggplant handles wet season conditions better than most fruiting vegetables. Thai round varieties and long Asian types are best adapted. Start seeds in September, transplant in October, and harvest through the wet season. Use exclusion netting for fruit fly protection.

Herbs for the Wet Season

• Lemongrass: Plant divisions at the start of the build-up. Grows into large clumps during the wet. Essential for Thai and Vietnamese cooking. Virtually indestructible in Darwin conditions.
• Turmeric: Plant rhizome pieces in October. Grows 1 metre tall through the wet season. Harvest when foliage yellows and dies back in the dry season (June to July).
• Ginger: Plant rhizomes in September or October in rich soil with afternoon shade. Grows actively through the wet season. Harvest fresh ginger from May onwards.
• Thai Basil: More heat and humidity tolerant than sweet basil. Sow seeds or plant cuttings year-round. Harvest regularly to prevent flowering and extend production.
• Vietnamese Mint: Thrives in wet conditions. Plant cuttings in a pot to contain its spread. Produces continuously with minimal care. Excellent in rice paper rolls and salads.
• Perennial Coriander (Sawtooth Coriander): Standard coriander bolts within days in Darwin's heat. Sawtooth coriander is a tropical perennial with similar flavour. Plant in partial shade for year-round production.

Managing Your Wet Season Garden

Drainage is the critical factor. Raised beds at least 30 centimetres high are essential in Darwin. The city's soils are often sandy but poorly structured, and heavy wet season downpours can waterlog even well-drained sites temporarily. Mound planting rows for root crops like sweet potato.

Mulch prevents soil erosion during the intense monsoon rainfall. A thick layer of sugar cane mulch (10-15 centimetres) protects soil structure. It breaks down rapidly in the heat and humidity, so replenish every 3-4 weeks.

Mosquitoes breed prolifically during the wet season. Empty all standing water from saucers, pots, and containers after rain. Cover rainwater tanks with mesh. Use personal protection (long sleeves, repellent) when gardening at dawn and dusk. Keep your garden tidy to reduce mosquito harbourage.

Fungal diseases spread rapidly in wet season conditions. Space plants generously for airflow. Remove any diseased foliage immediately and dispose of it in the bin (not the compost). Avoid working among plants when foliage is wet.

Frequently Asked Questions