
Details
Mild, lightly peppery komatsuna microgreens with a red-burgundy blush on green seed leaves, ready to cut 8–12 days after sowing.
SPECIFICATION
Seed
| Common name | Red komatsuna microgreens (Japanese mustard spinach) |
| Botanical name | Brassica rapa var. perviridis |
| Seed type | Conventional, untreated, non-GMO |
| Seeds per gram | approx. 250–350 |
Growing
| Difficulty | Easy: good for beginners |
| Growing medium | Potting soil or coco coir |
| Sowing rate | 20 g per 25 × 50 cm (1020) tray, range 15–25 g; about 1.6 g per 10 × 10 cm |
| Soaking | Not needed: sow dry |
| Blackout | 2–3 days under a lightly weighted cover |
| Temperature | 18–22 °C |
| Harvest | 8–12 days after sowing, when the seed leaves are fully open |
Taste and colour
| Flavour | Mild and sweet with a light peppery note; crisp, tender bite |
| Colour | Green seed leaves with a red-burgundy blush; slender, pale to pink stems |
ABOUT
Komatsuna, Brassica rapa var. perviridis, is a leafy Japanese green, often sold as Japanese mustard spinach. Despite that name it is not a spinach: it belongs to the same species as turnip, pak choi and mizuna. This red form grows green seed leaves with a red-burgundy blush on slender, pale to pink stems.
The taste is gentle: sweet and mild, with a light peppery note and nothing sharp. So it adds colour to a plate without the heat of radish or mustard. Like most cabbage-family microgreens it is quick and forgiving. Under the cover the seedlings are pale; the red blush comes once the tray is in light, usually within a day or two.
Why 20 g per tray? At about 250–350 seeds per gram, 20 g gives roughly 5,000–7,000 seeds, enough for a full, even tray. Sow nearer 15 g if you want more air between the stems, or nearer 25 g for a denser crop. Much thicker keeps the surface damp and invites mould.
IN THE KITCHEN
Add red komatsuna at the very end, because heat softens it quickly. Snip it over miso soup or ramen, scatter it on grain bowls and salads, or tuck it into sandwiches and wraps. The mild taste won't overpower other flavours, and the red blush adds colour. It tastes best on the day you cut it. Keep the cut greens dry in a closed box in the fridge and use them within 3–5 days.
GROWING INSTRUCTIONS
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