When to plant Radish in Temperate Australia

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

Radish is the rare crop you can sow direct in temperate Australia in any month of the year — January through December, the window never closes. Seed sown 15 mm deep is up within 5–10 days, and roots are ready in 40–60 days, quick enough to tuck between slower vegetables and be gone before the space is missed. Cool weather gives the crispest, mildest roots; summer sowings run hotter in flavour and bolt faster, so choose a part-shaded spot in December and January. Sow short rows often rather than one long one — a fortnight's eating at a time is plenty.

Sowing calendar — temperate zone

Green months are your sowing window: January to December.

Growing notes

Hardiness is what keeps radish's window open year-round in temperate zones: frost doesn't bother it, so June and July sowings simply germinate and grow more slowly, while spring and autumn sowings race away. Mid-winter roots take the full 60 days; in the shoulder seasons, expect the quick end of the range.

Soil matters more than season. Radish wants loose, crumbly, stone-free ground — compacted soil gives forked, stunted roots — and it shouldn't follow a fresh application of manure or high-nitrogen fertiliser, which produces lush leafy tops sitting on disappointing roots. Full sun suits the cool months; a little afternoon shade helps in high summer.

Watering is where most radish crops are lost. Erratic moisture — bone dry one week, soaked the next — makes roots split, turn woody or run unpleasantly hot. Keep the bed evenly damp from sowing to harvest and the roots stay crisp and mild.

• Sow 15 mm deep and thin early to 3–7 cm apart, with rows 20–30 cm apart
• Pull roots as soon as they size up; left too long they go pithy and hollow
• Re-sow a short row every two to three weeks for a steady supply
• Summer sowings bolt quickest, so harvest those young

Radish at a glance

Companion planting

Grows well with

Lettuce: Classic pairing — radish harvested before lettuce needs space

Lettuce: Harvested early before lettuce needs space; radish loosens soil

Nasturtiums: Nasturtiums deter flea beetle which attacks radish

Common questions

Can you grow radishes all year round in Australia?

In temperate zones, yes — radish can be sown direct in every month of the year. Winter sowings just grow more slowly, taking closer to the full 60 days.

How long do radishes take to grow?

Seed germinates in 5–10 days and roots reach eating size in 40–60 days, faster in the warmer months. Pull them promptly once they size up.

Why are my radishes all leaves and no root?

Usually too much nitrogen, too much shade, or overcrowding. Skip fresh manure before sowing, give them sun, and thin seedlings to 3–7 cm apart.

Why are my radishes woody and hot?

Erratic watering and late harvesting are the main causes. Keep soil evenly moist from sowing onwards and pull roots as soon as they're ready.

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