How to Grow Mitsuba

Soil & Growing Conditions

Water: moist soil, mulch to conserve moisture (NC State Extension, Savvy Gardening)

Growth Stages

Stage	BBCH	Notes
Sowing	0	Sow about 1/4in deep in late spring and again in late summer or early autumn; seed can be slow to germinate, 2-4 weeks (Savvy Gardening).
Leaf growth (shade-adapted)	3	Takes an upright habit in shade, more horizontal in sun; full sun causes yellowing and bitterness (NC State Extension).
Root development	4	Thick roots develop, usable as a cooked starchy vegetable (NC State Extension).
Flowering	6	Small white star-shaped flowers appear in umbrella clusters on stems exceeding 3ft (NC State Extension).

Quick Facts

Factor	Value
Soil texture	clay, loam or sand (NC State Extension)
Drainage	well-drained
Lifecycle	perennial
Edible parts	leaves, roots

At a Glance

Harvest & Storage

When to pick: Roots can be cooked and eaten as a starchy vegetable; leaves used fresh as salad greens or cooked. CAUTION: low-severity poison if eaten in large quantities; can cause skin irritation with repeated contact (NC State Extension).

Diseases

Grey mould

low

Botrytis cinerea

Soft brown fruit decay; Fuzzy grey-brown mould

NC State Extension names this directly: grey mould, in greenhouse settings.

Pests

Glasshouse whitefly

low

Trialeurodes vaporariorum

NC State Extension names this directly: whiteflies, in greenhouse settings.

Snails

low

Gastropoda (snails, various spp.)

NC State Extension names this directly: snails.

Slugs

low

Gastropoda (slugs, various spp.)

NC State Extension names this directly: slugs.

What the research guides add

Mitsuba prefers the opposite of most herbs: shade.

• A perennial with thick roots whose leaves grow straight from the root base; it takes on an upright habit in shade and a more horizontal one in sun. (NC State Extension)
• In full sun the leaves tend to yellow and can take on a more bitter taste. (NC State Extension)
• It is typically grown as an annual, depending on climate, and is easily cultivated by seed or propagated by division. (NC State Extension)
• Leaves can be used as salad greens, and the roots can be cooked and eaten as a starchy vegetable. (NC State Extension)

Sources for this section

• NC State Extension: Cryptotaenia japonica (Plant Toolbox)

Section researched and checked on 25 October 2026 by the SoilCommander Editorial Team. How we check facts: editorial policy.

Sources

1. Gardener's Path - How to Grow Mitsuba

   Grows in anything from full sun to full shade but performs best with shade; in full sun the leaves may turn yellow and the flavour turns more bitter. Prefers moist, well-draining soil, adaptable to soil type; compost helps both drainage and retention. Direct sow after spring frost danger passes, a quarter-inch deep, kept consistently moist; germinates in 1-2 weeks. Sow every six weeks for continuous harvests. Thin to 6-9in apart once seedlings reach 3in. Reaches about 2ft tall and 1ft wide. Herb harvest from 50-60 days when plants are 5-7in tall; vegetable harvest at 80 days with stalks 8-10in. Larger leaves grow increasingly bitter. A self-sowing perennial, though often grown as an annual; pinch flowers to prevent unwanted self-seeding. Pests: slugs and snails. Disease: downy mildew in cool, moist conditions.

2. Plants For A Future (PFAF) - Cryptotaenia japonica

   PFAF entry for Cryptotaenia japonica. Fetched and parsed directly for the USDA hardiness rating.

3. Savvy Gardening - How to Grow Mitsuba in Your Herb Garden

   A secondary gardening reference rather than a university or horticultural authority, used for sowing depth/timing detail NC State's basic profile does not cover, not contradicted by it. Also called Japanese parsley or honewort, the name meaning "trefoil" or "three-leaf" for its foliage. Sow seed about 1/4in deep in late spring and again in late summer or early autumn; seed can be slow to germinate, taking 2-4 weeks. Can be sown indoors 6-8 weeks before the last expected frost. Keep soil moist; organic mulch helps conserve moisture and suppress weeds. Low-maintenance, does not typically need fertilising, though amending soil with compost before planting helps. Takes an upright habit in shade, more horizontal in sun.

These 3 sources are specific to this region. The full list of 4 sources behind this guide (Gardener's Path, NC State Extension, Plants For A Future (PFAF) and others) is in the references of our UK guide to mitsuba; they describe the plant itself, which is the same wherever it grows.