How to Grow Komatsuna

Updated June 2026

A cool-season leafy green for the home garden.

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

🌱 Plant profile: Komatsuna, with sowing times for your region, companion plants and common pests.

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 Imported cabbageworm. 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 also: Komatsuna in the plant library →

Related guides