Mizuna in Zone 4a & 4b
Brassica rapa var. nipposinica
When to plant mizuna in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Mizuna doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Apr 24–May 1 |
| Estimated harvest | Jun 3–Jun 10 (~40 days after direct-sowing) |
Spacing: 9 per square foot (square-foot-gardening spacing). Mature height: 0.5-1 ft.
Mizuna is a feathery-leaved Japanese mustard green prized for its mild, slightly peppery flavor and quick turnaround, one of the fastest crops you can put in a salad-garden bed.
How mizuna fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Mizuna needs about 40 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Mizuna.
Where to buy mizuna seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing mizuna" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Mizuna in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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