How to Grow Red Cabbage Jewel
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Red Cabbage Jewel
Brassica oleracea var. capitata f. rubra
vegetableRed Cabbage Jewel is a hybrid red cabbage cultivar known for its deep purple-red color, dense heads, and excellent storage capacity. This variety produces medium-sized, uniform heads with a crisp texture and sweet flavor, making it ideal for both fresh eating and culinary applications. It's a cold-hardy brassica that matures reliably and resists splitting.
When should you plant Red Cabbage Jewel in your zone?
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Example Red Cabbage Jewel timeline · Pittsburgh, PA (Zone 6b)
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Plant Red Cabbage Jewel
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 Red Cabbage Jewel
Around Jul 1≈ 75 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Red Cabbage Jewel dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; cool-season crop that tolerates frost and light freezes
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Get my Red Cabbage Jewel timeline →Growth Stages
Seedling
3-4 weeksSmall plants with 2-4 true leaves, compact growth habit, dark green foliage beginning to show hints of purple in older varieties
Maintain consistent moisture and warmth (65-75°F). Provide bright light to prevent leggy growth. Thin or transplant to individual cells at 3-4 weeks old.
Transplant/Establishment
2-3 weeks after transplantingStocky plants with 6-8 true leaves, beginning to develop stronger purple coloration in leaf veins. Root system expanding.
Harden off by gradually exposing to outdoor conditions over 7-10 days. Plant in garden when 4-6 inches tall. Water well after transplanting. Mulch lightly.
Vegetative Growth
4-6 weeksRapid foliage expansion with larger, deeply colored purple-red leaves. Plant thickens and spreads. No head formation yet.
Maintain consistent watering and fertility. Side-dress with compost or balanced fertilizer at 3-4 weeks after planting. Monitor for cabbage worms and other pests. Weed regularly.
Head Formation/Heading
3-4 weeksLeaves begin curling inward, forming a tight, dense, purple-red head. Head gradually enlarges and becomes increasingly firm.
Continue consistent watering to prevent head splitting or hollow hearts. Reduce nitrogen fertilization to discourage excess foliage. Support heads if plants are in windy locations.
Mature/Harvest Ready
Ready for harvest; can extend 2-4 weeksFully developed, solid, deep purple-red heads with a waxy sheen. Heads feel firm when gently squeezed. Outer leaves begin to yellow slightly.
Stop watering excessively after maturity to reduce splitting. Heads can remain in field longer than green cabbage and tolerate light frosts. Harvest when ready or leave in garden for extended storage.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Row covers on young plants; Bacillus thuringiensis (Bt) spray; hand-pick caterpillars; neem oil; crush yellow eggs on leaf undersides
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Bt spray; spinosad; neem oil; encourage natural parasitoid wasps; remove affected leaves
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Remove by hand; row covers; reflective mulches; encourage beneficial insects; spinosad if severe
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Row covers for young plants; diatomaceous earth; neem oil; reflective or yellow sticky traps
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Row covers; tarped soil with transplant holes; parasitic nematodes; crop rotation 3+ years
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Ensure good drainage; raise soil pH to 7.0+; practice 4-year crop rotation; remove infected plants; sanitize tools
Uses
Fresh Eating & Slaws
CulinaryRed Cabbage Jewel's crisp texture and sweet flavor make it perfect for coleslaw, salads, and fresh slicing. Its vibrant purple-red color adds visual appeal to plates and remains stable when raw. [source]
Fermentation & Pickling
CulinaryExcellent for fermented sauerkraut and kimchi, where the anthocyanin pigments create striking colors. Its firm head structure ensures a satisfying crunch after fermentation. [source]
Cooking & Braising
CulinaryHolds its color and texture when cooked, making it ideal for braised dishes, stir-fries, and hot soups. Develops subtle sweetness when slowly cooked. [source]
Anthocyanin & Antioxidant Source
MedicinalRed cabbage is rich in anthocyanins, powerful antioxidants linked to anti-inflammatory and cardiovascular benefits. Regular consumption supports overall wellness and may reduce chronic disease risk. [source]
Natural Food Coloring & pH Indicator
HouseholdRed cabbage juice can be used as a natural pH indicator (turns pink/red in acids, blue in bases) and as a food coloring agent. A classic science project and culinary technique. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest when heads are firm, dense, and reach 4-6 inches in diameter (typically 75-90 days after transplanting). Cut heads at the base with a sharp knife, leaving 2-3 outer wrapper leaves on. Red Cabbage Jewel stores exceptionally well—keep in cool (32-40°F), humid conditions (90% humidity) for 3-6 months. Can be harvested during light frosts; flavor actually improves after cold exposure. For continuous harvest, sow at 3-week intervals.
Fun Facts
- 🌱 Red cabbage contains anthocyanins—the same powerful antioxidant pigments found in blueberries and red wine. When pickled in vinegar, these pigments intensify and create striking pink or magenta colors.
- 🌱 Red Cabbage Jewel was specifically bred for uniform head size, excellent storage life, and split resistance, making it a favorite among commercial growers and home gardeners alike.
- 🌱 Cabbage can be stored for up to 6 months in proper cold storage (32-40°F, 90% humidity), making it one of the longest-keeping fresh vegetables and a staple for winter nutrition in traditional root cellars.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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