When to plant Mint in Cool Australia

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

Mint is raised as seedlings and transplanted out from September to December in the cool zone. Sow seed just 2 mm deep in punnets, expect germination in 7–21 days, and plant out at 30–50 cm spacing once frosts are easing — around late October in Ballarat or Canberra. Plants take about 90 days to reach full productivity, then barely need you again: mint is hardy, dying back to the ground in a frosty winter and reshooting from its roots every spring. The real cool-climate question is not whether mint will grow, but how you intend to stop it.

Sowing calendar — cool zone

Green months are your sowing window: September to December.

Growing notes

Frost is a non-event for established mint. In Armidale or Orange the top growth blackens with the first hard freezes around late April, the plant retreats underground, and fresh shoots push through again as the soil warms in spring — a rhythm you can rely on for years. The frost-sensitive stage is only the transplant itself: seedlings raised in punnets through September and October should go out after the worst frosts pass, or under a cloche if you are planting at the early end of the window.

Timing within the window matters less than for most crops, since this is a permanent planting. Early transplants establish before summer; December plantings just need more diligent watering through their first weeks. Mint wants moisture above all — rich soil, part shade to full sun, and never allowed to bake dry, which turns the leaves harsh and invites rust.

The classic failure is the opposite of failure: mint escaping. Its runners will quietly annex a whole bed in a season or two.

• Plant into a large pot, or sink a bottomless bucket into the bed
• Keep it 30–50 cm clear of other perennials
• Shear plants back hard mid-season for fresh regrowth
• Divide and replant a chunk every few years when the centre exhausts

Mint at a glance

Companion planting

Grows well with

Peas: Deters aphids and pea moth

Peas: Deters aphids and pea moth

Cabbage: Strong scent deters cabbage white butterfly

Common questions

When should I plant mint in the cool zone?

Raise seedlings and transplant from September to December, ideally after the main frosts ease in late October. Seed is sown 2 mm deep and germinates in 7–21 days.

Does mint die in winter in cold climates?

The top growth dies back with hard frost, but mint is hardy and the roots survive cool-zone winters easily. It reshoots every spring without replanting.

How do I stop mint taking over my garden?

Confine it. Grow it in a large pot or sink a bottomless container into the bed so the runners cannot spread, and site it 30–50 cm from anything you value.

How long until mint is ready to pick?

Around 90 days from sowing to a fully productive plant, though you can pinch the odd sprig earlier once transplants are established.

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