What to plant in Australian Capital Territory in May
May in the Australian Capital Territory marks the transition to winter, with average minimum temperatures dropping to 3.2°C and frosts becoming frequent. Gardening efforts must focus exclusively on cold-tolerant species that can withstand the significant temperature decline anticipated in June and July.
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Sowing
Recommended sowing
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Broad Beans
Sow directly into the soil; these are highly frost-tolerant and thrive in Canberra's cool autumn.
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Garlic
Plant individual cloves with the pointy end up; requires the winter chill for bulb development.
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Onions
Sow in seedbeds or direct; can handle the upcoming June temperature drop to 0.9°C.
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Peas
Provide a trellis for support; sow early in the month to establish before July's peak cold.
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Spinach
Sow directly; thrives in the current t_avg of 7.8°C.
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Radish
Direct sow every two weeks for a continuous supply.
Seedlings
Seedlings
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Kale
Transplant established seedlings now to ensure they are rooted before June's 0.9°C minimums.
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Broccoli
Protect young transplants from extreme overnight frosts with cloches if necessary.
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Cabbage
Ensure firm soil at planting to support heavy heads.
Tasks
Monthly tasks
Apply a thick layer of organic mulch to insulate soil against upcoming frosts. Clean and store irrigation timers that are not frost-rated. Begin pruning deciduous fruit trees as they enter dormancy. Prepare frost blankets or cloches for sensitive leafy greens as the t_min approaches 0°C in the coming weeks.