How to Grow Casper Cauliflower

Casper Cauliflower

Brassica oleracea var. botrytis

vegetable

Casper is a hybrid cauliflower variety known for producing large, pure white heads with excellent flavor and texture. It is a cool-season brassica that thrives in moderate temperatures and is valued for both fresh market and processing uses. The variety is known for its reliability, uniform head development, and disease resistance.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; afternoon shade beneficial in hot climates

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Water: Consistent moisture; 1.5-2 inches per week. Keep soil evenly moist but not waterlogged. Irregular watering causes head defects and riciness.

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Spacing: 18-24 inches between plants; rows 30-36 inches apart inches

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Days to maturity: 60-80 days from transplant

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Planting depth: Transplants: set at same depth as nursery pot. Seeds: 0.25-0.5 inches deep

Soil

Type: Rich, well-draining loamy soil with high organic matter

pH: 6.0-7.5

Amendments:

Compost aged manure balanced fertilizer (10-10-10 or similar) calcium (lime) to prevent hollow stem and riciness

Growing Zones

Find your zone →

Thrives in zones 3-9; best grown in spring (northern zones) or fall (warmer zones)

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

Growth Stages

Seedling

4-6 weeks

Young plants with 2-4 true leaves; small and delicate with light green coloring

Maintain 65-75°F temperatures. Provide consistent moisture and bright light. Start indoors 5-6 weeks before transplanting.

Vegetative Growth

3-4 weeks after transplanting

Rapid leaf development; plants form multiple large leaves and establish strong root systems

Harden off transplants before planting out. Space adequately to prevent crowding. Apply balanced fertilizer every 2-3 weeks. Keep weed-free.

Head Initiation

2-3 weeks

Central growing point begins forming curds; visible head formation starts at center

Maintain consistent cool temperatures (55-70°F ideal). Increase phosphorus and potassium fertility. Ensure steady water supply.

Head Development

3-4 weeks

Compact white curds form and enlarge; heads become dense and dome-shaped

Continue consistent watering and fertilization. For pure white heads, gently bend outer leaves over head to shade from sun (blanching). Monitor for pests and diseases.

Harvest Ready

Variable; harvest within 7-10 days of maturity

Heads reach 6-8 inches diameter; curds are tight, compact, and pure white with no yellowing

Check head firmness daily once mature. Harvest when heads feel solid. Avoid harvest during extreme heat.

Companion Planting

Plan your garden →

Plant with:

Beets celery chard dill garlic onions potatoes spinach thyme chamomile

Avoid planting near:

Broccoli cabbage kale kohlrabi other brassicas (within same season) strawberries tomatoes pole beans

Common Pests

Row covers until flowering; Bt (Bacillus thuringiensis) spray; pick off by hand; introduce parasitic wasps
Strong water spray to dislodge; insecticidal soap; neem oil; encourage natural predators like ladybugs
Bt spray; hand-pick; row covers; encourage parasitic wasps and birds
Row covers on young plants; neem oil; diatomaceous earth; resistant varieties
Yellow sticky traps; insecticidal soap; neem oil; encourage parasitic wasps
Crop rotation (3-4 years); lime to raise soil pH; choose resistant varieties; remove infected plants

Uses

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Fresh eating and cooking

Culinary

Casper cauliflower has excellent flavor and tender texture suitable for roasting, steaming, boiling, or eating raw. The white color makes it visually appealing in various dishes. [source]

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Processing and freezing

Culinary

The uniform head size and quality of Casper make it ideal for commercial processing, freezing, and canning. It maintains texture and appearance well when processed. [source]

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Nutritional and anti-cancer properties

Medicinal

Cauliflower contains glucosinolates and isothiocyanates, compounds with potential cancer-fighting properties. It is also rich in vitamin C, K, and dietary fiber. [source]

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Vegetable production

Household

As a high-value crop, Casper cauliflower is excellent for market gardeners and commercial growers seeking reliable yields and quality for farmers markets and wholesale distribution. [source]

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Pollinator and beneficial insect habitat

Wildlife

When allowed to flower (for seed production), cauliflower provides nectar and pollen for bees and other beneficial insects that support garden ecosystems. [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 6-8 inches in diameter, firm, and compact. Cut with a sharp knife leaving 2-3 inches of stem. Harvest in early morning for best quality. Casper cauliflower can be harvested over several weeks as secondary heads may form. Do not wait for heads to flower or expand excessively, as quality declines. Store at 32°F with high humidity for 2-3 weeks.

Fun Facts

🌱 Casper cauliflower was developed to be a hybrid variety with improved uniformity, disease resistance, and pure white color that requires minimal blanching compared to older open-pollinated varieties.
🌱 The white color of cauliflower curds is a natural trait (unlike the purple or green varieties that evolved from different mutations), making Casper's reliability for consistent white heads particularly valuable commercially.
🌱 Cauliflower is actually a flower bud cluster (curd) that is harvested before it blooms; if left unharvested, the white curds would eventually elongate into yellow flowers with small edible seeds.

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