What to plant in Hawaii in September
In this high-elevation zone of Hawaii, September marks the onset of autumn with cool conditions averaging 11.8°C and moderate rainfall of 77.2 mm. These temperatures restrict plantings strictly to cold-tolerant cool-season vegetables, as upcoming months trend cooler and wetter. Gardeners should prioritize hardy brassicas, roots, and leafy greens while omitting all warm-season crops.
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Aussaat
Empfohlene Aussaat
Spinach
Sow directly outdoors 1 cm deep; current average temperature of 11.8°C is optimal for rapid germination.
Radish
Sow seeds directly 1.5 cm deep; grows vigorously under current mild 15.2°C daytime peaks.
Carrots
Direct sow in loose, stone-free soil; keep seedbed damp until germination occurs.
Kale
Direct sow or start in seed trays outdoors; thins out to 30 cm spacing.
Turnips
Sow directly outdoors; adapts well to current cool temperatures before October rains increase.
Arugula
Surface sow lightly and press in; repeat sowings every two weeks for continuous cutting.
Peas
Direct sow 2.5 cm deep along a support trellis; benefit from current 10.4 hours of daily sunlight.
Scallions (Green Onions)
Sow directly outdoors 0.5 cm deep; resilient to upcoming temperature drops in November and December.
Pflanzen
Pflanzen
Cabbage
Transplant established nursery starts 40 cm apart; mulch base to conserve soil temperature.
Broccoli
Set sturdy seedlings into garden beds with fertile, well-draining soil; firm the soil around roots.
Swiss Chard
Space seedling transplants 25 cm apart; cold tolerance will carry it through lower winter temperatures.
Tasks
Monthly tasks
Clear declining summer residues and incorporate compost into planting beds. Mulch bare soil to insulate root zones as nighttime temperatures drop toward 8.5°C. Check drainage around beds to prepare for significant precipitation increases in October (151.2 mm forecasted). Monitor young brassica transplants for slugs and snails, which thrive in cooler, humid conditions.