How to Grow Broccoli Calabrese Green Goliath
Broccoli Calabrese Green Goliath
Brassica oleracea var. italica
vegetableGreen Goliath is a premium broccoli cultivar known for producing exceptionally large, dense head clusters with a deep green color and superior flavor. This heat-tolerant variety is ideal for both spring and summer growing, maintaining quality even in warm conditions. The plants are vigorous and productive, often yielding secondary side shoots after the main head is harvested.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; excellent heat tolerance makes it suitable for summer growing in warmer regions
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Growth Stages
Seedling
7-14 daysCotyledons emerge, followed by true leaves. Plants develop a small root system and establish their first set of compound leaves.
Maintain 70-75°F soil temperature. Provide 12-14 hours of light daily under grow lights. Keep soil moist but not soggy. Thin seedlings if overcrowded.
Transplant/Establishment
3-4 weeksYoung plants develop 4-6 true leaves and strengthen stems. Root system expands into larger containers or soil.
Harden off seedlings gradually over 7-10 days before transplanting outdoors. Space properly to avoid crowding. Begin light fertilizing at half-strength once true leaves appear.
Vegetative/Leaf Development
3-5 weeksPlants produce robust foliage with large, blue-green leaves. Strong stems thicken and plants establish deep root systems.
Provide consistent water and nitrogen-rich fertilizer every 2-3 weeks. Mulch around base to retain moisture and regulate soil temperature. Remove yellowed lower leaves. Monitor for pests early.
Head Formation/Maturation
2-3 weeksTerminal bud develops into a large, compact head with tightly clustered florets. Head size increases rapidly and deepens in color.
Reduce nitrogen slightly; increase phosphorus and potassium for head quality. Continue consistent watering—critical for large head development. Shade developing heads if temperatures exceed 85°F to preserve color and quality.
Harvest/Secondary Shoots
Ongoing through seasonMain head reaches optimal size (6-10 inches diameter) with tight, dome-shaped florets. After harvesting, axillary shoots develop smaller secondary heads.
Cut main head when firm and before florets begin to separate. Continue watering and fertilizing to encourage side shoots. Harvest secondary heads at 2-3 inches diameter for tenderness.
Common Pests
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Row covers during early growth; Bt (Bacillus thuringiensis) spray; neem oil; hand-pick caterpillars
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Bt spray; row covers; parasitic wasps; spinosad for severe infestations
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Strong water spray to dislodge; insecticidal soap; neem oil; encourage beneficial insects like ladybugs
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Row covers; diatomaceous earth; spinosad; kaolin clay spray for prevention
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Rotate crops; maintain pH 7.0+; remove infected plants immediately; disinfect tools; improve drainage
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Improve air circulation; avoid overhead watering; fungicidal sulfur spray; resistant varieties
Uses
Steaming and roasting
CulinaryBroccoli florets are excellent steamed whole or chopped for 4-6 minutes, or roasted with olive oil and garlic at 425°F for 15-20 minutes. The large, tender florets of Green Goliath are particularly suited to these preparations. [source]
Raw vegetables and salads
CulinaryFresh florets can be eaten raw in salads or as crudités. Young side shoots are especially tender and sweet when eaten raw, and the thick stems can be peeled and sliced for salads. [source]
Glucosinolate and sulforaphane benefits
MedicinalBroccoli contains glucosinolates that break down into sulforaphane, a compound with potential anti-cancer and anti-inflammatory properties. Cooking slightly increases bioavailability of these compounds. [source]
Stem preparation and waste reduction
HouseholdThe thick, edible stems of Green Goliath can be peeled to remove the fibrous outer layer, revealing tender flesh inside. Stems can be steamed, roasted, or added to soups and stir-fries, minimizing plant waste. [source]
Pollinator and beneficial insect support
WildlifeIf left unharvested, broccoli flowers attract bees, butterflies, and other beneficial insects. Allowing some plants to bolt provides food for pollinators and beneficial predatory insects. [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 the main head when it is firm, compact, and deep green, typically 6-10 inches in diameter. Cut with a sharp knife at an angle 6-8 inches below the head, leaving leaves attached to protect the head. Harvest in the morning for peak flavor and firmness. Green Goliath will produce multiple secondary side shoots (3-5 inches) after main head removal, which mature in 7-14 days. Continue harvesting until frost or temperatures become too warm. Heads are best quality when daytime temperatures are 60-70°F; above 85°F florets may separate and lose quality.
Fun Facts
- 🌱 Green Goliath broccoli was specifically developed to be exceptionally heat-tolerant, making it one of the few broccoli varieties that can be successfully grown as a summer crop in warm climates where other broccoli fails.
- 🌱 The 'head' of broccoli is actually a cluster of unopened flower buds called the 'curd.' If left unharvested, these buds will bloom into yellow flowers, which are still edible and nutritious.
- 🌱 Broccoli is a relatively modern vegetable; it was developed from wild cabbage in Italy during the Roman era and was not widely cultivated outside Italy until the 1600s. It didn't become popular in the United States until the 20th century.
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