How to Grow Komatsunas Canada
On this page
Komatsuna (Brassica rapa var. perviridis) — annual or biennial grown as an annual.
The short answer
- Site
- soil pH 5.5–6.8
- Biggest risk
- Downy mildew
Core growing advice on this page is checked against named horticultural sources — see References.
Komatsuna (Brassica rapa var. perviridis)
3 sources cited · Verified
At a Glance
Quick Facts
| Factor | Value |
|---|---|
| Soil pH | 5.5 - 6.8 |
| Soil texture | fertile, loamy (MorningChores) |
| Drainage | well-drained |
| Lifecycle | annual or biennial grown as an annual |
| Edible parts | leaves |
Soil & Growing Conditions
Water: moisture-retentive, well-draining (MorningChores)
Soil pH range
Span reflects genuine variation between the cited authorities, not a single agreed figure.
Growth Stages
| Stage | BBCH | Notes |
|---|---|---|
| Sowing | 0 | Sow 1/4-1/2in deep, 6in apart with 18-24in between rows, spring through late summer; successive sowings every two weeks (MorningChores). |
| Thinning | 3 | Thin to 4in apart for baby leaves, or 8in for mature plants (Seedy Farm). |
| Leaf growth | 4 | Nitrogen-rich fertiliser at planting, liquid feed 15-20 days after germination; full sun with afternoon shade in harsh climates (MorningChores). |
| Harvest | 8 | Matures in 30-40 days; cut leaving at least 2in of stem for regrowth, usually good for at least two cuttings (MorningChores, Seedy Farm). |
Harvest & Storage
When to pick: Matures in 30-40 days; harvest leaves at any stage. Cut with shears or a sharp knife leaving at least 2 inches of stem so the plant regenerates -- usually at least two cuttings are possible. Pluck any flowers to maintain productivity (MorningChores, Seedy Farm).
Diseases
Pests
Komatsuna, Leaf to Table
Plan your Komatsunas planting
When to sow and plant Komatsunas depends on your own frost dates. Check the Canada vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
Growing Komatsuna in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
Sources
The full list of 3 sources behind this guide (MorningChores, Seedy Farm, Useful Temperate Plants) is in the references of our UK guide to komatsuna; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
What soil pH does komatsuna need?
A pH of about 5.5–6.8. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect komatsuna?
Our data links 2 diseases and 3 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Short-season growing is arithmetic before it is technique: days to maturity against frost-free days decides what will finish at all. The Canada Garden Planner does that subtraction for your region before you sow.
Get the Canada Garden Planner →Instant PDF download · Written for Canadian growing conditions
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against Canadian hardiness-zone and frost-date data, with provincial agriculture and university extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
Vegetable Growing Guides Canada
Related Problem Guides
Last verified 2026-09-02
Related guides
More from the same group (brassicas & mustards):
Growing advice for your part of Canada
Timing and conditions change a lot inside one country. These guides cover frost dates and growing seasons region by region.
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.