When to plant Mizuna in Temperate Australia

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

Sow mizuna direct in the cool of July and August, tucking the seed about 6 mm deep into moist, fertile soil. This is a fast, hardy Japanese green well suited to the coldest, quietest part of the temperate calendar, germinating in 6–12 days and ready to cut in a brisk 35–50 days. Space or thin plants to 20–30 cm apart, with rows 20–30 cm apart, or grow closer for baby leaves. Melbourne, Adelaide and Perth gardeners use the late-winter window to fill the hungry gap before spring, harvesting mildly peppery, deeply serrated leaves for salads and stir-fries while little else is cropping.

Sowing calendar — temperate zone

Green months are your sowing window: July to August.

Growing notes

Mizuna is a hardy brassica prized for producing tender leaves in cold conditions, which is exactly why this July and August window works so well in temperate gardens. While much of the patch is idle in late winter, mizuna germinates in 6–12 days and races to a first cut in 35–50 days, giving fresh greens weeks before the spring crops arrive.

The classic failure is bolting once the weather warms. Late-winter sowings that sit uncut into a warm spring will throw flower stalks and turn bitter, so harvest promptly and keep sowing small successions rather than relying on one long-standing patch. Picking the outer leaves regularly, cut-and-come-again style, keeps plants productive and delays bolting.

Watch for slugs and snails, which are at their worst in cool, damp late-winter beds and can shred seedlings overnight; a night patrol or beer trap after rain keeps them in check. As a mustard-family plant, mizuna also draws caterpillars and flea beetle as it warms up, so a cover of lightweight exclusion netting keeps the leaves clean once spring insects appear. Grow it in full sun to part shade on rich, moisture-retentive soil and never let it dry out, since drought stress is another trigger for bolting. In cold Melbourne or Adelaide winters a cloche or low tunnel speeds germination and gives a slightly earlier cut.

Mizuna at a glance

Common questions

Can I really sow mizuna in the middle of winter?

Yes, mizuna is hardy and the July and August window suits it well in temperate gardens. It germinates in cool soil in 6–12 days and gives fresh greens in late winter when little else is cropping.

Why does my mizuna keep going to seed?

Warming weather and drought stress both trigger bolting in mizuna. Harvest young, keep the soil consistently moist, and sow small successions rather than leaving one patch to stand into a warm spring.

What eats mizuna seedlings in winter?

Slugs and snails are the main culprits in cool, damp late-winter beds and can destroy seedlings overnight. Check the bed after rain, use traps or barriers, and add netting once spring caterpillars and flea beetle appear.

How is mizuna different from mitzuna in the garden?

They are the same leafy green under slightly different spellings, with very similar growing needs. Both are fast, hardy salad brassicas; simply follow the sowing months and spacing listed and treat them the same way.

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