When to plant Garlic in Temperate Australia

Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Cool · Subtropical · Tropical · Arid.

Garlic goes in from April to August in temperate Australia, sown direct as individual cloves pushed 20–30 mm deep, pointy end up, 10–12 cm apart. Shoots appear within 14–21 days, and from there it is a long, quiet 140 days to harvest — plant in autumn, dig bulbs in early summer. Cold is a feature, not a problem: garlic is fully hardy and needs a stretch of chilly weather to trigger the bulb to divide into cloves. All it asks in return is free-draining soil, full sun, and a bed you can keep weeded.

Sowing calendar — temperate zone

Green months are your sowing window: April to August.

Growing notes

Frost is no threat to garlic in temperate Australia — it will sit green and unbothered through every frost from May to October. The timing question is at the front end: within the April-to-August window, earlier is generally better. An April or May planting gives roots time to establish before the cold sets in and produces noticeably bigger bulbs than a late-winter planting, because bulb size tracks how much leaf the plant has grown by the time spring lengthens the days. August plantings still succeed, but expect more modest heads.

Choose the sunniest, best-drained bed available. Waterlogged winter soil rots cloves before they ever shoot, so raise the bed or work in coarse compost if your ground holds water. Plant the biggest cloves from the outside of the bulb, keep the bed weeded — garlic competes poorly against weeds all winter — and water in spring while the bulbs are swelling, then taper off as harvest approaches.

The most common disappointment is small bulbs or a bulb that never divided. Late planting is the usual cause, followed by shade and weed pressure. Harvest when about half the leaves have browned; leave it too long and the bulbs split their skins and store poorly. Cure the lifted bulbs somewhere airy and shaded for a few weeks before plaiting or trimming.

Garlic at a glance

Companion planting

Grows well with

Rosemary: Both deter pests; garlic deters aphids, rosemary carrot fly

Tomatoes: Deters spider mites and aphids on tomatoes

Strawberries: Deters aphids and fungal disease

Keep away from

Bean (Bush): Alliums stunt legume growth by inhibiting nitrogen-fixing bacteria

Bean (Climbing): Alliums stunt legume growth

Peas: Alliums inhibit nitrogen-fixing bacteria in legume roots

Common questions

When should I plant garlic in temperate Australia?

Plant cloves from April to August, and lean early — autumn plantings in April or May generally produce the biggest bulbs. Garlic needs cold weather to form cloves, so winter suits it perfectly.

How long does garlic take to grow?

Around 140 days from planting to harvest, with shoots appearing in 14–21 days. An autumn planting is typically ready to lift in late spring or early summer, once about half the leaves have browned off.

Why did my garlic grow one round bulb instead of cloves?

A single undivided round usually means the plant did not get enough cold, most often from planting too late in the season. It is still perfectly edible, and planting earlier next autumn usually fixes it.

Does frost damage garlic?

No — garlic is fully hardy and grows happily through a temperate Australian winter. Cold is actually required for the bulb to divide properly.

Can I plant supermarket garlic?

Imported supermarket garlic is often treated to stop it sprouting and may carry disease, so results are unreliable. Australian-grown seed garlic from a nursery or garlic farm establishes far better.

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