Komatsuna in Zone 4a & 4b
Brassica rapa var. perviridis
When to plant komatsuna 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. Komatsuna doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 1–May 8 |
| Estimated harvest | Jun 10–Jun 17 (~40 days after direct-sowing) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Komatsuna is a fast, mild-flavored Asian brassica green, notably more heat- and cold-tolerant than spinach while offering a similar leaf texture and taste, which makes it a useful stand-in during the stretches of the season spinach won't tolerate.
How komatsuna fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Komatsuna needs about 40 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Komatsuna.
Where to buy komatsuna seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing komatsuna" 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 Komatsuna in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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