Last edited on November 01, 2026. View history
Ruruhau Mustard Greens
Ruruhau Mustard Greens
A variety of mustard greens
A fast-growing, mustard-flavoured green of the open-hearted cabbage type. An old vegetable of the north, found growing wild all over the north and around the coast of New Zealand. Adds a mustard flavour to casseroles, boil-ups and stews, and the small leaves are good in a winter salad. Self seeds readily. Sow in trays in spring and early autumn, prick out at 3 cm and transplant when the leaves touch at 25 cm.
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Ruruhau mustard greens facts
Lifespan
Crop cycle
Max altitude
Optimal light
What are growing degree days?
A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.
Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.
For Ruruhau mustard greens, the FAO EcoCrop database gives a lowest growing temperature of 7°C and a shortest growing cycle of 50 days at its best temperature, about 725 growing degree days to a first harvest.
Where you've told us where your garden is, we use this and the weather there to predict when your Ruruhau mustard greens will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.
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Time to harvest
If sown now, expect a first harvest in about 50 to 100 days.
From the growing cycle in the FAO EcoCrop database, which is the same wherever it is grown.
Ecological requirements
Data from the FAO EcoCrop database for Brassica juncea (L.)Czern.
| Family / Taxonomy | Magnoliopsida Dilleniidae Capparales Cruciferae |
|---|---|
| Killing temperature | growth: 0 °C, rest: -5 °C |
| Life form | herb |
| Life span | annual |
| Habit | erect |
| Optimal soil depth | shallow (20-50 cm) |
| Optimal soil texture | medium, organic |
| Optimal soil fertility | high |
| Optimal soil drainage | well (dry spells) |
| Optimal soil salinity | low (<4 dS/m) |
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