How to Grow January King Cabbage
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January King Cabbage
Brassica oleracea var. capitata
vegetableJanuary King is a heritage winter cabbage variety known for its distinctive blue-green leaves with purple-red coloring and excellent cold hardiness. It produces medium-sized, dense heads that are particularly flavorful after frost exposure, making it ideal for late-season harvests. This variety stores exceptionally well and was traditionally grown to provide fresh cabbage through winter months.
When should you plant January King Cabbage in your zone?
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Example January King Cabbage timeline · Pittsburgh, PA (Zone 6b)
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Plant January King Cabbage
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest January King Cabbage
Around Aug 15≈ 120 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; particularly well-suited to zones 5-8 for winter harvest
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Seedling
4-6 weeksSmall plants with 2-4 true leaves, 3-4 weeks old; pale green coloring begins to show blue-green pigmentation
Keep soil moist but not waterlogged; provide bright light; thin seedlings to prevent damping off; start hardening off 7-10 days before transplanting
Vegetative Growth
6-8 weeksEstablished plants with 6-12 leaves; distinctive blue-green foliage emerges; plant begins spreading and developing stronger root system
Maintain consistent watering; apply mulch to retain moisture and suppress weeds; monitor for pests; side-dress with nitrogen fertilizer if growth appears slow
Head Formation
6-8 weeksLeaves begin overlapping and curling inward; head becomes compact and dense; purple-red veining becomes more prominent
Ensure consistent, even moisture to prevent splitting; reduce nitrogen to avoid excessive leaf growth; monitor soil pH and nutrient levels; provide calcium if blossom end rot appears
Maturation & Cold Hardening
4-6 weeks or longerHead reaches full size and density; color deepens significantly after frosts; outer leaves become tough and protective; heads become sweeter as starches convert to sugars
Allow light frosts to improve flavor; reduce watering gradually; check head firmness by gentle pressure; heads can remain in field through winter in most zones
Harvest
Harvest window extends 4-8 weeks or longer if left in groundFirm, dense heads ready for cutting; distinctive blue-purple coloring at peak; leaves may show frost damage but interior head is pristine
Harvest when heads feel solid; cut cleanly at base with sharp knife; remove outer leaves for storage; store in cool, humid conditions (32-40°F, 90-95% humidity)
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Row covers on young plants; Bt (Bacillus thuringiensis) sprays; hand-pick eggs and caterpillars; companion planting with aromatic herbs
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Bt sprays; neem oil; row covers; encourage natural predators like parasitic wasps
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Row covers for seedlings; neem oil or spinosad sprays; diatomaceous earth; remove debris harboring overwintering beetles
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Strong water spray to dislodge; insecticidal soap; neem oil; encourage ladybugs and lacewings
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Avoid planting brassicas in same spot for 4+ years; improve drainage and raise pH; remove infected plants immediately; choose resistant varieties if available
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Remove infected leaves; avoid overhead watering; provide good air circulation; practice crop rotation; use disease-free seed
Uses
Winter cooking and storage vegetable
CulinaryJanuary King is prized for its sweet, tender leaves perfect for winter coleslaw, braising, soups, and stews. Its excellent storage qualities made it traditionally grown for eating fresh through winter months. [source]
Fermentation and pickling
CulinaryThe dense heads and crisp texture make January King ideal for sauerkraut, kimchi, and pickled cabbage preservation. Its mild flavor and tender leaves take on fermentation flavors beautifully. [source]
Anti-inflammatory and digestive support
MedicinalLike all brassicas, January King contains glucosinolates and sulforaphane compounds with anti-inflammatory properties. Traditionally used in folk medicine to support digestive health and boost winter immunity. [source]
Poultice and skin applications
HouseholdCabbage leaves have been traditionally used in folk medicine as compresses for wounds, inflammation, and rheumatism. The leaves conform well to body contours and retain moisture effectively. [source]
Pollinator and beneficial insect attraction
WildlifeJanuary King flowers (if left to bolt) attract pollinators and parasitic wasps that control cabbage pests. Flowering plants support late-season wildlife. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
January King is typically harvested in late autumn through winter after exposure to frost, which improves flavor. Cut heads at the base with a sharp knife when they feel solid and dense (usually 4-5 weeks after head formation begins). Harvest from bottom leaves outward if leaving roots in ground for continuous harvest. Best flavor develops after temperatures drop below 50°F. Heads can be left in field and harvested as needed through mild winters; in harsh climates, cut and store in cool (32-40°F), humid conditions with roots intact for extended storage lasting 3-6 months.
Fun Facts
- 🌱 January King earned its name from its traditional harvest and storage period—gardeners could cut fresh cabbage in January in mild climates, making it a treasured winter vegetable in British gardening heritage.
- 🌱 The distinctive blue-green coloring with purple-red veining is caused by anthocyanin pigments that intensify after frost exposure, making the cabbage not only hardier but more beautiful as temperatures drop.
- 🌱 This heritage variety has been documented since at least the 1800s and remains relatively unchanged, making it one of the most stable and reliable open-pollinated cabbage varieties for home gardeners seeking seed-saving stability.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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