Soil & potting mix
Best soil for 'January King' Cabbage (Brassica oleracea var. capitata 'January King')
Also called January King winter cabbage.
More about 'january king' cabbage
About 'January King' Cabbage
Brassica oleracea var. capitata 'January King' · also called January King winter cabbage · edible
January King is a classic, extremely hardy winter cabbage forming a dense, drum-shaped head with crinkled blue-green outer leaves flushed purple-red in cold. Sown in late spring, it stands in the ground through autumn and winter to harvest from late autumn into late winter. It needs full sun, firm fertile soil and a long, cool season, rewarding patience with a sweet, frost-kissed head.
Preferred mix: Rich, firm, moisture-retentive loam, pH 6.5-7.5
Watch for — Clubroot: Soil-borne disease swelling and rotting roots, stunting plants over the long season. Lime to near-neutral pH, improve drainage, and rotate brassicas on a 3-4 year cycle.
Why 'january king' cabbage needs this mix
'January King' Cabbage hates drying out, so it wants a mix that stays evenly moist — but it still needs perlite so "moist" never tips into "waterlogged".
- 'January King' Cabbage comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
- Coir and compost give that reserve, while perlite keeps enough air that the constantly-moist mix does not turn anaerobic.
- Even moisture also keeps its thin leaves from crisping at the edges, which is this plant’s most visible stress signal.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons 'january king' cabbage struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A free-draining, gritty mix dries too fast for 'january king' cabbage — you get crispy brown edges and frond or leaf drop within days of one missed watering.
- A pure, airless peat mix swings the other way: it holds water but suffocates the fine roots and rots the crown.
- Letting the mix dry to the point it shrinks from the pot is very hard to re-wet evenly and stresses the plant badly.
Using a sharp, fast-draining "houseplant" or cactus-leaning mix that lets 'january king' cabbage dry out. It needs a moisture-retentive but still airy blend.
pH — does it matter for 'january king' cabbage?
'January King' Cabbage prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A good peat-free houseplant compost works for 'january king' cabbage straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Drainage and the pot
Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Peat-free mixes slump and compact as they hold moisture, so refresh 'january king' cabbage's mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. When the time comes, our repotting guide for 'january king' cabbage covers the timing and technique step by step.
'January King' Cabbage soil — frequently asked questions
What is the best soil mix for 'january king' cabbage?
3 parts peat-free houseplant compost : 1 part coco coir : 1 part perlite. 'January King' Cabbage comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
Can I use normal potting soil for 'january king' cabbage?
A free-draining, gritty mix dries too fast for 'january king' cabbage — you get crispy brown edges and frond or leaf drop within days of one missed watering. A good peat-free houseplant compost works for 'january king' cabbage straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Does 'january king' cabbage need a special pH?
'January King' Cabbage prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
Should I buy a bagged mix or make my own for 'january king' cabbage?
A good peat-free houseplant compost works for 'january king' cabbage straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
How often should I refresh the soil for 'january king' cabbage?
Peat-free mixes slump and compact as they hold moisture, so refresh 'january king' cabbage's mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Keep reading
- 'January King' Cabbage care — the full brief (light, water, humidity, problems, pet safety)
- How often to water 'january king' cabbage — the schedule the mix feeds into
- Repotting 'january king' cabbage — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Underwatered plant — signs and how to rehydrate it
- Why is my plant wilting? Wet vs dry diagnosis
- Should I water my plant? The simple check first
- Best soil for tomato
- Best soil for pepper
- Best soil for cucumber
- All 1284 soil and potting-mix guides in the Growli library