GardenAnnual Leafy Green · 4 varieties
Mizuna
Brassica rapa (Japonica group)
Brassicaceae — the same plant family as cabbage, radish, broccoli, cauliflower and 12 more here. Relatives share pests and diseases, which is why rotation plans group by family.
Mizuna (Brassica rapa (Japonica group)) is an annual leafy green. It wants full sun and pH 6–7 soil, with about 1 in of water weekly. It matures in about 18–40 days from sowing. Watch for flea beetles and downy mildew. Below: its full sourced profile from 4 extension sources, plus a planting calendar timed to your frost dates.
Typical dates for zone 6b — set your zone or ZIP for yours. This calendar assumes the crop is direct sown. Timing is a guide from the crop's sourced growth stages; confirm with your local frost dates and extension before you sow.
What we will not put a number on
We do not give a feeding rate for this crop, and that is deliberate rather than a gap. The figures published by extension services are pounds of nitrogen per acre for a production field — they do not convert safely to a raised bed or a pot without knowing your soil test and your fertilizer's analysis, and guessing errs toward burning roots. It is also why every chart you find online disagrees with the next one.
We give watering as a depth per week rather than gallons per plant, because that is how it is actually measured and how the published figures are written. A gallons-per-plant number depends on your spacing, your soil and whether the plant is in a pot — so it would look more precise than it is.
Site & soil
- Sun
- Full sun
- Soil pH
- 6–7est
- Soil texture
- Well drained
- Frost tolerance
- Half hardy
No published figure for the temperature frost starts to hurt it, the temperature that would kill it and a heat limit. We looked — where a number is missing here it is missing from the research, not skipped. The crop’s frost and heat tolerance above still applies.
The plant
- Mature height
- 12–18 in
- Mature spread
- 12–18 in
- Growth rate
- Fastest
- Spacing in row
- 4–18 in
- Between rows
- 2–18 in
- Planting depth
- 0.25 in
- Container size
- 1 galest
- Support
- Self-supportingest
- Grown from
- Direct sow
Water & feeding
- Water needs
- Moderate
- Water per week
- 1 in/wkest
- Critical water
- Germinationest
- Feeding
- Moderate
Timing & fruiting
- Days to maturity
- 18–40 days from seed
- Harvest cues
- Rapid leaf growth
Planted again for autumn
- Sow by
- early Oct typical · zone 6b
18 days to maturity from sowing, counted back from the first frost above. Not published for anywhere in particular: it is your own frost date and this crop's own figure, which is why it works wherever you are. A days-to-maturity figure is a catalog number for a good season rather than a promise, and a cold month moves it.
Edible parts per source: leaf, stem.
Compiled from the extensions cited below. Which ones actually show up depends on your region — your extension's local list is the last word.
| Variety | Type | Habit | Days | Color | What it is known for |
|---|---|---|---|---|---|
| Japanese Red Mustard Heirloom | Red Mizuna | 18–40 | Purple | ||
| Miz America F1 | Red Mizuna | 40 | Red | Johnny's Selected Seeds describes this astakes the cold · takes the heat | |
| Heirloom | Green Mizuna | 40 | Green | Penn State Extension records this astakes the cold · slow to run to seed in heat | |
| Red Kingdom F1 | Red Mizuna | Upright | 40 | Purple | All-America Selections describes this asan All-America Selections winner · slow to run to seed in heat |
- Johnny's Selected Seeds
- Missouri Botanical Garden
- Penn State Extension
- University of Maryland Extension
We compile bare facts from these university-extension and horticultural sources, never copied prose. 13 of the 19 values on this page carry a citation. The rest are marked est; hover one and it says why — either nobody publishes a figure we could point at, or a person set it and attached no source. Figures vary with climate and seed source; confirm with your local extension before you buy.
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