Komatsuna

Family: Brassicaceae Leafy Green

Tender, peppery-sweet Komatsuna arrives with a crisp, juicy bite and a gently savory aroma that feels bright and alive in the garden.

Its leaves are smooth and succulent, holding their texture beautifully for fresh use—ideal for quick sautés, steaming, and stir-fries, as well as silky sauces and simple pickles that showcase its clean brassica character. At about 40 days from sowing, you’ll be harvesting with confidence from a steady, leafy rhythm that keeps the flavor vivid from first cut to the next.

Light: Part SunMaturity: 40 DaysHabit: Rosette

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	May 28th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	40
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	30
Harden Off (days)	6

Culinary Notes

Chef's Note

Komatsuna’s tender, juicy leaf and mild-but-perky pepper edge make it a quick-heat star—you don’t need to cook it into mush to get flavor. It pairs especially well with salty-sweet umami (soy, sesame) and sharp lift (rice vinegar) so it stays crisp and vivid on the plate.

Best Uses

quick wok stir-fries where the leaves stay bright and snappy
fast sauté or steam to keep the pepper notes intact
silky blending into a sauce for noodles or dumplings
simple quick pickles that highlight its clean, vegetal tang

Flavor Profile

peppery-sweet bite crisp, juicy leaf texture gently savory brassica aroma

Kitchen Pairings

garlic ginger soy sauce sesame oil rice vinegar chicken or tofu

Frequently Asked Questions

What pest or disease commonly affects Eruca vesicaria subsp. sativa (komatsuna), and how do I treat it?

Komatsuna commonly suffers from cabbage loopers (and other brassica caterpillars) that chew irregular holes in the leaves. Check plants every 2–3 days and hand-pick early infestations; for heavier pressure, spray Bacillus thuringiensis (Bt) and repeat as label directions specify. If you see persistent yellowing and wilting, remove affected plants promptly to reduce spread, because brassicas can develop soilborne/crown issues under overly wet conditions.

How often should I water komatsuna during its main growth phase (about weeks 2–6)?

Keep the soil evenly moist but not waterlogged—aim for light, frequent watering so the top 1–2 inches never fully dry out. During warm weather, that often means watering once daily or every other day depending on your soil and container size; water at the base to reduce leaf wetness. If leaves start looking dull or edges crisp in the heat, increase moisture immediately to prevent bolting.

How can I tell when komatsuna is ready to harvest?

Harvest when plants reach about 6–8 inches tall and leaves are tender—typically around 35–40 days from sowing. Use scissors to cut outer leaves first, leaving the center to regrow for multiple harvests. If you notice flowering stalks forming, quality declines quickly, so harvest immediately at the first sign of bolting.