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Broccoli Calabrese

Broccoli Calabrese

Brassica oleracea var. italica

vegetable

Broccoli Calabrese is a cool-season cruciferous vegetable prized for its large, edible green flower heads (curds) and thick central stalks. Native to Calabria, Italy, it's one of the most popular broccoli varieties grown in home gardens and commercially. Rich in vitamins C and K, fiber, and antioxidants, it thrives in moderate climates with consistent moisture.

Looking for a specific variety?

Calabrese Green Goliath Packman Arcadia De Cicco Purple Peacock

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum; afternoon shade helps in hot climates
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Water: Consistent moisture; 1-1.5 inches per week. Keep soil evenly moist but not waterlogged. Water deeply at the base to prevent fungal issues.
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Spacing: 18-24 inches apart in rows 24-30 inches apart inches
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Days to maturity: 55-100 days depending on variety and conditions
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Planting depth: 0.5 inches for seeds; transplants at same depth as nursery pots

Soil

Type: Well-draining, fertile loamy soil rich in organic matter
pH: 6.0-7.5
Amendments:
Compost aged manure balanced NPK fertilizer calcium (lime if needed)

Growing Zones

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Thrives in zones 3-9; prefers cooler temperatures (60-70°F)

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

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Growth Stages

1

Seedling

2-4 weeks

Small plants with 2-4 true leaves, 2-3 weeks old

Keep soil moist but not soggy. Provide bright light (grow lights if indoors). Maintain 60-70°F. Harden off transplants before planting outside.

2

Vegetative Growth

3-6 weeks

Plants develop multiple true leaves, 6-12 inches tall, forming dense foliage canopy

Keep consistently moist. Side-dress with compost or balanced fertilizer every 3 weeks. Mulch to retain moisture and regulate soil temperature. Watch for cabbage worms and aphids.

3

Head Formation

2-3 weeks

Central bud cluster begins to develop into a compact, tightly-budded head (curd)

Maintain even watering—critical at this stage to prevent bolting or splitting. Continue light fertilizing with nitrogen. Remove any yellowing lower leaves.

4

Head Maturity

1-2 weeks

Main head reaches 4-8 inches diameter, compact and deep green with tight buds, thick stalk

Monitor daily for harvest readiness. Cooler temperatures (below 70°F) produce better quality. Ensure steady water supply. Side-shoots will develop after main head harvest.

5

Harvest & Regrowth

2-4 weeks for side-shoots

After cutting main head, smaller side-shoot heads form from leaf axils

Cut main head at an angle to shed water. Continue watering and light feeding for side-shoots. Secondary heads are smaller but still flavorful.

Companion Planting

Plan your garden →

Plant with:

Beet Chamomile Dill Garlic Onion Potato Spinach Thyme Marigold Nasturtium

Avoid planting near:

Cabbage Cauliflower Kale Kohlrabi Fennel Mustard Pepper Strawberry Tomato

Common Pests

  • Row covers before butterflies appear; hand-pick caterpillars; Bt (Bacillus thuringiensis) spray; neem oil

  • Row covers; Bt spray; neem oil; hand-pick; encourage natural predators like parasitic wasps

  • Strong water spray to dislodge; insecticidal soap; neem oil; plant reflective mulch; encourage ladybugs

  • Row covers on seedlings; diatomaceous earth; neem oil; reflective mulch; avoid excess nitrogen

  • Rotate crops 4+ years; improve soil drainage; raise soil pH to 7.2+; remove infected plants; use resistant varieties

  • Ensure good air circulation; avoid overhead watering; copper fungicide; sulfur dust; remove infected leaves

Uses

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Fresh cooking & roasting

Culinary

Broccoli Calabrese is excellent steamed, roasted, stir-fried, or eaten raw in salads. The thick stalk is edible and nutritious when peeled. Rich in vitamin C, K, and folate. [source]

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Broccoli cream soups & purees

Culinary

The tender florets and stalks blend smoothly into velvety soups and sauces. Pairs well with garlic, cheese, and cream. [source]

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Anti-cancer & detoxification support

Medicinal

Contains sulforaphane, a compound with demonstrated anti-cancer properties, and supports liver detoxification pathways. Often recommended in cancer prevention diets. [source]

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Organic garden pest control

Household

Broccoli plants attract parasitic wasps and other beneficial insects that prey on garden pests, making them valuable in integrated pest management and polyculture systems. [source]

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Pollinator & beneficial insect support

Wildlife

If allowed to flower (bolt), broccoli produces small yellow flowers that attract bees, hoverflies, and other pollinators essential for garden ecosystem health. [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 the central head is tight, compact, and deep green—typically 4-8 inches in diameter. Cut 5-8 inches down the stalk with a sharp knife, cutting at a slight angle. Best harvested in cool morning hours. The head should feel firm when squeezed. Do not wait until the flower buds begin to open or separate (bolting). After removing the main head, secondary side-shoots will develop for continued harvesting over 2-4 additional weeks.

Fun Facts

  • 🌱 Broccoli Calabrese originated in Calabria, Italy in the 16th century and was virtually unknown in North America until Italian immigrants introduced it in the early 1900s.
  • 🌱 The entire broccoli head is technically an inflorescence—a cluster of unopened flower buds. If left unharvested, it will flower into small yellow blooms that attract bees.
  • 🌱 A single broccoli plant can produce 5-10 pounds of edible heads and side-shoots over a season when harvested correctly, making it one of the most productive cool-season vegetables.

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