When to plant Mizuna in Subtropical Australia

Subtropical zone — applies to Brisbane, Gold Coast, Sunshine Coast, Coffs Harbour, Lismore and similar areas. Growing elsewhere? Temperate · Cool · Tropical · Arid.

Sow mizuna direct in any month of the year in the subtropics, though the mild autumn-to-winter stretch gives the best results and the least bolting. Set seed 6 mm deep into moist, fertile soil; it germinates in 6–12 days and matures fast at 35–50 days, with cut-and-come-again leaves ready well before that. Space plants 20–30 cm apart with rows 20–30 cm apart, or sow more thickly for baby-leaf salads. Around Brisbane and the Sunshine Coast this quick, hardy Japanese green is one of the most productive leafy crops you can grow, offering feathery, mildly peppery foliage for salads, stir-fries and soups almost year-round.

Sowing calendar — subtropical zone

Green months are your sowing window: January to December.

Growing notes

Mizuna is a fast, hardy leaf that fits into almost any gap in the subtropical bed. While it can technically be sown all year here, it performs best through the mild months and struggles most in the peak of summer, so lean your main sowings towards autumn and winter and treat summer plantings as a bonus in a shadier, well-watered spot.

Bolting is the classic failure mode. In the heat and long days of a Gold Coast summer, plants run to seed early and the leaves sharpen and toughen. Keep water consistent, give some afternoon shade in the warm months, and harvest young. Sowing a short row every two to three weeks keeps a rolling supply of tender leaves rather than a single glut.

As a brassica, mizuna attracts caterpillars, aphids and flea beetles, which chew and stipple the leaves, while slugs and snails shred seedlings after subtropical rain. A layer of fine mesh netting keeps most of these off and keeps the foliage salad-clean. Downy mildew can also appear in prolonged wet, so space plants for airflow and water at the base in the morning to let the leaves dry.

Mizuna at a glance

Common questions

can you grow mizuna all year in Brisbane

You can sow it in any month, but it performs best through the mild autumn and winter. Summer sowings are worth trying in a shadier, well-watered spot, but they are more prone to bolting in the heat.

how fast does mizuna grow

Very fast. It germinates in 6–12 days and matures in 35–50 days, with cut-and-come-again leaves ready well before that. Sowing thickly gives you tender baby leaves even sooner.

why does my mizuna taste too peppery and tough

Heat, dryness and bolting sharpen and toughen the leaves. Grow it in the cooler months, keep watering consistent, give afternoon shade in summer, and harvest young for the mildest, most tender leaves.

what is the difference between mizuna and mitzuna

They are the same Japanese mustard green (Brassica rapa var. nipposinica), just spelled differently. Both are fast, hardy, mildly peppery leaves grown the same way in the subtropics.

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