How to Grow Calabrese Broccoli 'Belstar'

Calabrese Broccoli 'Belstar'

Brassica oleracea var. italica

vegetable

Belstar is a hybrid calabrese broccoli variety known for its large, deep green heads with tight, uniform florets and excellent cold tolerance. This variety is prized by home and commercial growers for its vigor, reliability, and ability to produce quality heads even in challenging conditions. The plants are vigorous and disease-resistant, making them ideal for gardeners seeking consistent, high-quality broccoli.

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum

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Water: Consistent moisture; 1-1.5 inches per week. Broccoli prefers evenly moist soil—avoid drought stress and waterlogging. Water at the base to prevent disease.

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Spacing: 18 inches

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Days to maturity: 55-75 days from transplant; 90-100 days from seed

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Planting depth: 0.25-0.5 inches for seed; transplants set at soil level

Soil

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

pH: 6.0-7.5

Amendments:

Compost or aged manure Nitrogen-rich fertilizer Calcium (lime if pH is low) Boron (optional, prevents hollow stems)

Growing Zones

Find your zone →

Thrives in zones 3-9; excellent for cool-season growing

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

Growth Stages

Seedling

2-3 weeks

Tiny plants with first true leaves appearing; cotyledons visible initially

Keep soil moist but not waterlogged. Provide bright light to prevent legginess. Maintain temperature around 65-75°F. Thin seedlings to 2-3 inches apart if direct seeding.

Vegetative Growth

3-4 weeks

Rapid leaf and stem development; plants becoming bushy with larger true leaves

Maintain consistent watering and provide balanced fertilizer every 2 weeks. Side-dress with nitrogen-rich fertilizer once plants are established. Keep soil consistently moist. Monitor for cabbage worms and other pests.

Head Formation

2-3 weeks

Central head (terminal curd) begins to form as a tight cluster of green florets at the plant apex

Increase nitrogen feeding; broccoli is nitrogen-hungry at this stage. Ensure consistent watering to avoid bolting. Provide mulch to retain moisture and keep roots cool. Begin harvesting side shoots after main head is cut.

Maturation & Harvest

1-2 weeks for main head

Main head reaches full size (4-8 inches) with tightly closed green florets; side shoots may develop after main head removal

Harvest the main head when florets are tight and deep green, before any yellowing or flowering. Use a sharp knife to cut 6-8 inches below the head. Continue harvesting side shoots every few days for extended production.

Secondary Production

2-4 weeks

After main head harvest, numerous smaller side shoots develop along the stem

Continue regular watering and light nitrogen feeding. Harvest side shoots when 3-6 inches long for best quality. Remove all yellow or damaged leaves to encourage new growth.

Companion Planting

Plan your garden →

Plant with:

Beets Carrots Celery Chard Lettuce Onions Parsley Potatoes Spinach Thyme

Avoid planting near:

Fennel Kohlrabi Other brassicas (in close rotation) Strawberries Tomatoes

Common Pests

Use row covers on young plants; Bt (Bacillus thuringiensis) spray; handpick caterpillars; encourage parasitic wasps
Bt spray; neem oil; row covers; encourage natural predators like parasitic wasps and tachinid flies
Handpick bugs and egg clusters; row covers; reflective mulch; neem oil spray
Strong water spray to dislodge; insecticidal soap; neem oil; encourage ladybugs and lacewings
Row covers on young plants; diatomaceous earth; kaolin spray; neem oil
Crop rotation (3-4 years); lime to raise soil pH; ensure good drainage; resistant varieties; remove infected plants

Uses

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Fresh Cooking & Steaming

Culinary

Calabrese broccoli is a classic fresh vegetable, excellent steamed, roasted, or stir-fried. Its tender, well-formed florets and mild flavor make it suitable for countless dishes. [source]

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Nutritional Powerhouse

Culinary

Broccoli is exceptionally rich in vitamin C, vitamin K, folate, and fiber. It's also a notable source of glucosinolates, compounds with potential anti-cancer properties. [source]

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Immune & Bone Support

Medicinal

High in vitamins C and K, broccoli supports immune function and bone health. Some research suggests compounds in broccoli may offer anti-inflammatory benefits. [source]

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Freezing & Preservation

Household

Broccoli freezes exceptionally well for long-term storage. Blanch florets briefly, cool in ice water, and freeze for convenient year-round use in soups, stir-fries, and casseroles. [source]

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Pollinator & Beneficial Insect Support

Wildlife

If allowed to flower (bolt), broccoli provides nectar and pollen for bees and beneficial insects. The small yellow flowers attract hoverflies, parasitic wasps, and other natural pest controllers. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Cut the main head when the floret clusters are tight and deep green, before any yellowing or flower buds open. Use a sharp knife to make a clean cut 6-8 inches below the head. Harvest in the cool morning for best quality. After removing the main head, continue harvesting side shoots (secondary heads) that will develop along the stem—cut when 3-6 inches long for tender, flavorful broccoli. Belstar typically produces abundant side shoots, extending the harvest season by several weeks. Broccoli is best consumed fresh but can be refrigerated for up to 2 weeks in a plastic bag or frozen after blanching for 3-5 minutes.

Fun Facts

🌱 Belstar is an Italian heirloom-inspired hybrid that combines traditional calabrese genetics with modern disease resistance and vigor, making it both reliable and flavorful.
🌱 Broccoli 'Belstar' was bred for exceptional cold tolerance and can produce quality heads even after light frosts—making it perfect for fall and early spring harvests in cooler climates.
🌱 The name 'calabrese' refers to the Calabria region in southern Italy, where this type of broccoli originated and remains a culinary staple.

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