When to plant Zucchini in Cool Australia

Cool zone — applies to Hobart, Canberra, Ballarat, Orange, Armidale and similar areas. Growing elsewhere? Temperate · Subtropical · Tropical · Arid.

Sow zucchini direct from October to December in the cool zone, with a final follow-up sowing possible in January thanks to the crop's speed — as little as 50 days from sowing to first fruit, though slower varieties can take up to 100. Seed goes in 15–20 mm deep once frosts finish and germinates in roughly six to twelve days in warm soil. Space plants 50–80 cm apart; two or three feed a household. In Hobart and Orange, that January sowing is the insurance policy — it fruits through March just as spring-sown plants fade with mildew.

Sowing calendar — cool zone

Green months are your sowing window: October to January.

Growing notes

Zucchini is frost tender, so the cool-zone season runs strictly between the last frost in late October–November and the first in late April. Within that, the crop's speed buys unusual flexibility. An October or November sowing in Orange or Hobart fruits from around Christmas; the January follow-up sowing, often overlooked, produces fresh young plants that hit their stride in March while the spring-sown ones are succumbing to powdery mildew. Varieties needing closer to 100 days should stick to the spring sowings.

Resist sowing into cold soil. Seed wants genuine warmth to germinate, and early-October seed in ground that hasn't warmed simply rots — if in doubt, wait a fortnight or sow into mounds, which drain and warm faster. Sow 15–20 mm deep and allow the full 50–80 cm between plants; airflow matters for mildew control later in the season.

The most common early-season complaint is small fruit that yellow, rot from the flower end and drop off. That's failed pollination, common in cool spring weather when bees are scarce and plants produce mostly male flowers. Hand-pollinate in the morning — pick a male flower, strip its petals and dab the pollen into open female flowers — and the problem disappears as the weather warms.

Zucchini at a glance

Companion planting

Grows well with

Nasturtiums: Deters aphids and squash bugs

Marigold: Deters nematodes; attracts pollinators for better fruit set

Nasturtiums: Deters squash bugs and aphids

Common questions

When can I plant zucchini in Hobart?

Sow direct from October to December once frosts have passed and the soil has warmed, with a last sowing possible in January. Fast varieties fruit in as little as 50 days, so even the late sowing crops well before the April frosts.

Why are my baby zucchini rotting and falling off?

That's failed pollination, common in cool spring weather when bees are scarce. Hand-pollinate in the morning by dabbing pollen from a male flower into the female flowers; the problem usually resolves itself as summer warms up.

How fast does zucchini grow?

Quickly — germination takes roughly six to twelve days in warm soil, and the fastest varieties fruit about 50 days from sowing, though some take up to 100. Once fruiting, pick every day or two.

Is it too late to sow zucchini in January in a cool climate?

No — January is the last worthwhile sowing. A fast variety fruiting at around 50 days will crop through March, well ahead of the first frosts in late April. Slower 100-day varieties should be sown in spring instead.

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