Last edited by shiny on November 11, 2026. View history
January King Cabbage
A variety of cabbage
How to sow January king cabbage: Direct seed indoors, transplant seedlings outside after hardening off.
Sun requirement for January king cabbage: Plant in Full Sun
A flat-headed savoy cabbage with crinkled leaf edges whose outer leaves become purple-tinged with the frosts. Excellent flavour and good for all uses. Savoy cabbages are said to be higher in nutrition than other cabbages. Sow in trays in autumn or early spring, prick out at 3 cm and transplant 4 weeks later or at 6 to 8 cm high at 50 cm diagonal spacing. Sits well when planted in early autumn.
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January king cabbage 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 January king cabbage, the FAO EcoCrop database gives a lowest growing temperature of 7°C and a shortest growing cycle of 60 days at its best temperature, about 750 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 January king cabbage 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.
Growing January king cabbages
- Sow seeds in trays 5 weeks before planting out
- Dig compost into the bed 1 week before planting out
- Harden off the seedlings 1 week before planting out
- Firm the soil well around the stems at planting out
- Net against cabbage white butterflies at planting out
- Set or refill beer traps for slugs and snails at planting out every week
- Water regularly at planting out every week
- Check leaves for caterpillars 2 weeks after planting out every week
- Feed with a nitrogen fertiliser 4 weeks after planting out
- Cut heads once they feel firm at first harvest
- Pull out the stalks 4 weeks after first harvest
Plant January king cabbages with
cumin
blue lake bean
Photos
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January king cabbage plantings
Video
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Time to harvest
If sown now, expect a first harvest in about 60 to 200 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 oleracea var. capitata L. [Alef.]
| Family / Taxonomy | Magnoliopsida Dilleniidae Capparales Cruciferae |
|---|---|
| Killing temperature | growth: -1 °C, rest: -10 °C |
| Life form | herb |
| Life span | biennial |
| Habit | acaulescent (or rosette plants) |
| 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) |
| Photoperiod | neutral day (12-14 hours), long day (>14 hours) |
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