How to Grow Komatsuna

Updated June 2026

A cool-season leafy for the home garden across the warmer US.

Komatsuna is a rewarding cool-season crop for backyard growers.

When to plant

Komatsuna is a cool-season crop. In the South and Southwest, plant in fall through winter when the heat eases. See your region on the komatsuna page for exact timing.

Varieties

Komatsuna (Tendergreen), Fast, mild mustard spinach (Kitazawa/True Leaf Market)

How to grow it

Sun & soil: part sun to light shade, rich well-drained soil with even moisture.
Spacing: about 8 in between plants.
Sowing: barely cover the seed.
Water: roughly 1.1 gal per plant every 2 days in hot weather.
Containers: grows well in a pot of 8 in+.

Pests & problems

Watch for Flea beetle and Cabbage moth. In humid regions, Clubroot can appear, so space for airflow and water at the roots in the morning.

Harvest

Komatsuna is usually ready to harvest in roughly 5 weeks. Pick regularly to keep plants productive.

When to plant in your region

Pick your region to see exactly when to plant komatsuna where you garden.

See what to plant this month

Pick your region for a month-by-month calendar tuned to your climate.

Find your region →