How to grow mitsuba
Overview
Mitsuba (Cryptotaenia japonica) is a cool-season herb in the Apiaceae family, grown for its mild parsley-celery flavour and tender three-lobed leaves. It thrives in moist, shaded positions and is valued for repeat harvesting over many months.
Varieties
- Mitsuba — Standard green-leaf form, most common in AU/NZ.
- Mitsuba 'Purple' — Purple-stemmed variety with same flavour, adds colour to salads.
Soil Preparation
Prefers rich, loamy soil with pH 6.0–7.0. Dig in well-rotted compost or aged manure before planting. Ensure good drainage—mitsuba rots in waterlogged ground.
Growing Guide
Sow seed 5 mm deep in moist, rich soil, spacing 20 cm apart. Choose a bright, sheltered spot with dappled shade—avoid deep dry shade. Keep soil consistently damp; mitsuba will bolt if allowed to dry. In cool zones, plant in spring for summer harvest; in warm zones, sow autumn through winter. Thin to 15 cm for bushy growth.
Sowing
Sow direct 5 mm deep, 2–3 seeds per spot, 20 cm apart. Germinates in 10–14 days at 15–20°C. Can be started in punnets and transplanted when 4 leaves appear.
Care
Feed with a balanced liquid fertiliser (e.g. seaweed or fish emulsion) every 4–6 weeks during active growth. Remove yellowing or damaged leaves to encourage fresh shoots. Mulch with organic matter to retain moisture and suppress weeds.
Companion Planting
Plant beneath ferns, hostas, or in the shade of taller brassicas like kale. Avoid placing near heavy feeders like corn that compete for moisture.
Common Pests & Risks
Watch for snails and slugs, especially in damp shade—use iron-based pellets or beer traps. Aphids may appear on new growth; hose off or spray with neem oil.
Harvesting
Snip whole three-leaf stems at soil level once plants reach 15 cm tall. Harvest regularly to delay flowering; cut before stems toughen. Use fresh within 2 days.
In the Kitchen
Use fresh in salads, stir-fries, or as a garnish. The mild flavour suits Japanese dishes like miso soup and tempura. Store in a damp paper towel in the fridge for up to 3 days.
Troubleshooting
Yellow leaves: overwatering or poor drainage—reduce water, improve soil. Brown leaf edges: dry air or inconsistent moisture—increase humidity, water regularly. Bolting: heat or stress—shade plants and harvest often. Leggy growth: too little light—move to brighter spot. Snail damage: ragged holes—use bait or hand-pick.