When to plant Mustard Greens in Cool Australia

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

Sow mustard greens direct from January to June for tender, peppery leaves through the cooler half of the year. This hardy brassica germinates fast in 4 to 7 days at 5 mm deep and matures quickly in 40 to 60 days, so it slots neatly into the shoulder seasons. Space plants 15 to 25 cm apart with rows 30 to 40 cm apart, or sow more thickly for a baby-leaf cut. In cool gardens around Canberra, Ballarat and Orange, the late-summer-to-autumn window lets plants grow into cooling weather, which keeps the leaves sweet and slows the bolting that ruins hot-season sowings.

Sowing calendar — cool zone

Green months are your sowing window: January to June.

Growing notes

Mustard greens are a fast, hardy leaf crop that reward you most when grown into falling temperatures, which is why the cool-zone window runs from January to June. Sown from late summer into autumn, plants germinate in 4 to 7 days and grow steadily into the cold, producing tender, mildly hot leaves ready from around 40 days. Their hardiness means they keep going through light frosts that finish softer salads.

Bolting is the failure mode to plan around. The January end of the window catches summer warmth, and any heat spike or dry spell sends plants straight to flower, leaving the leaves coarse and unpleasantly sharp. In hotter gardens around Ballarat or Orange, lean towards the March-onward sowings, keep the soil consistently moist, and give young plants some afternoon shade during a heatwave.

As a brassica, mustard greens draw the usual crowd, cabbage moth caterpillars, aphids and flea beetle, though their quick turnaround usually limits real damage. Fine insect netting over the seedling rows keeps moths and beetles off and is the simplest protection. Grow them as cut-and-come-again, taking outer leaves and leaving the centre to regrow, and lift plants for the compost the moment they begin to run to seed, since the leaves only get hotter and tougher from there.

Mustard Greens at a glance

Common questions

When are mustard greens best sown in a cool climate?

From late summer into autumn, within the January to June window, so plants grow into cooling weather. This keeps the leaves sweet and tender and avoids the fast bolting that spoils crops sown into summer heat.

Why do my mustard greens taste so peppery and harsh?

Heat and drought stress intensify the flavour and trigger bolting, which coarsens the leaves. Grow them in the cooler months with steady moisture and pick young for a milder taste, and compost plants once they start to flower.

Do mustard greens survive frost in Canberra?

Yes, they are hardy and keep producing through Canberra's light frosts, which is what makes them so useful in autumn and early winter. Growth slows in the coldest weeks but the plants hold and remain pickable.

How do I protect mustard greens from cabbage moth?

Cover the seedling rows with fine insect netting to keep cabbage moths from laying on the leaves, which stops caterpillar damage before it starts. Their fast maturity also helps, as plants are often harvested before pests build up.

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