How to Grow Mitsuba UK

When to Plant Mitsuba in the UK

When to plant mitsuba in the UK: in Southern England, sow early May to late May. Find your area in the table below.

Region	Sow
Southern England	early May to late May
Midlands	early May to late May
Northern England	early May to late May
Scotland	early May to late May

Southern England - detail & sources

Savvy Gardening: sow late spring (and again late summer/early autumn), with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.

Midlands - detail & sources

Savvy Gardening: sow late spring (and again late summer/early autumn), with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.

Northern England - detail & sources

Savvy Gardening: sow late spring (and again late summer/early autumn), with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.

Scotland - detail & sources

Savvy Gardening: sow late spring (and again late summer/early autumn), with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.

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

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).

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.

Mitsuba, the Shade-Loving Japanese Parsley

Three leaves, hence the name

Mitsuba means "three leaves" in Japanese -- the trifoliate leaf is the plant's signature.

A woodland herb

Both sources agree it performs best in shade; full sun yellows the leaves and turns the flavour bitter.

Self-sowing perennial

Left to seed it spreads into a standing patch, though many growers treat it as an annual.

Tiny umbels

Small white flowers mark it out as an umbellifer, alongside parsley, carrot and celery.

Picked for the kitchen

Leaves are cut from 50-60 days; the blanched stalks take about 80 days and are used like celery.

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.

References

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. NC State Extension - Cryptotaenia japonica (Mitsuba, Japanese Honewort, Japanese Parsley...)

   A perennial herb with thick roots and leaves growing from the base; leaves have a clasping base, long stalk, and 3-toothed leaflets. Leaf stems reach about 6in; flower stems exceed 3ft, with small white star-shaped flowers in umbrella clusters. Native to Vietnam to Sakhalin and temperate eastern Asia. USDA zones 4a-8b. Deep shade, partial shade, or dappled sunlight -- full sun causes yellowing and a more bitter taste. Soil: clay, loam or sand; acid, neutral or alkaline pH; moist. Height/spread 12in to 3ft. Propagate by division or seed. Pests: slugs and snails, whiteflies (greenhouse settings). Diseases: grey mould (greenhouse settings). Roots can be cooked and eaten as a starchy vegetable; leaves used as salad greens. TOXICITY: low-severity poison, toxic only if large quantities eaten; can cause severe skin irritation following repeated contact (contact dermatitis) -- caution advised for those allergic to Apiaceae family plants.

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

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

4. 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.

4 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.