How to Grow Broccoli Raab
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Broccoli Raab
Brassica rapa subsp. rapa
vegetableBroccoli raab, also known as rapini, is a leafy green cruciferous vegetable with small broccoli-like flowering heads and tender stems. It has a slightly bitter, peppery flavor and is popular in Mediterranean and Asian cuisines. This cool-season crop matures quickly, typically in 40-70 days, making it ideal for spring and fall gardens.
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Example Broccoli Raab timeline · Pittsburgh, PA (Zone 6b)
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Plant Broccoli Raab
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 Broccoli Raab
Around May 27≈ 40 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Broccoli Raab dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-10, with best performance in cool-season zones 4-8
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Get my Broccoli Raab timeline →Growth Stages
Seedling
7-14 daysTiny round cotyledons emerge, followed by first true leaves that are deeply lobed and dark green.
Keep soil moist but not waterlogged. Thin seedlings to proper spacing once they have 2-3 true leaves. Protect from slugs with barriers or netting.
Vegetative Growth
20-35 daysPlant develops multiple stems with large, deeply lobed leaves. No flowering has begun yet.
Water regularly and maintain consistent moisture. Begin fertilizing with balanced or nitrogen-rich fertilizer every 2-3 weeks. Monitor for cabbage worms and aphids.
Bud Formation
5-10 daysSmall broccoli-like head clusters form at the center and along leaf axils. Stems become thicker and more succulent.
Increase watering slightly. Apply calcium-rich fertilizer to prevent tip burn. Check daily for pests as buds are attractive to insects.
Flowering Ready
3-7 days before harvestPrimary head reaches desired size (3-5 inches), still tightly budded with a slight purple or green tint. Side shoots are developing.
Begin harvesting the main head when buds are tightly closed. Harvest in early morning for best texture and flavor. Continue watering.
Secondary Harvest
14-28 daysAfter main head removal, multiple smaller side shoots sprout from leaf axils, extending harvest period by 2-4 weeks.
Continue regular watering and fertilizing. Harvest side shoots when 4-6 inches long before flowers open. Remove any flowering shoots immediately.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use row covers before infestation; apply Bacillus thuringiensis (Bt) spray; hand-pick larger worms; encourage parasitic wasps.
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Strong water spray to dislodge; insecticidal soap; neem oil; encourage ladybugs and lacewings.
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Row covers on young plants; neem oil; diatomaceous earth; reflective mulches.
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Prevent with proper soil pH (above 7.2); improve drainage; rotate crops 4+ years; remove infected plants.
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Improve air circulation; avoid overhead watering; sulfur spray; resistant varieties.
Uses
Sautéed and pasta dish
CulinaryBroccoli raab is a staple in Italian and Chinese cuisines, commonly sautéed with garlic, olive oil, and red pepper flakes or stir-fried with oyster sauce. The slightly bitter flavor complements pasta, rice, and seafood dishes. [source]
Nutritious greens preparation
CulinaryHigh in vitamins A, C, K, and folate, broccoli raab can be steamed, boiled, roasted, or blanched as a healthy side dish. Often served with lemon juice to enhance its peppery flavor. [source]
Glucosinolate-rich cancer prevention
MedicinalBroccoli raab contains glucosinolates, compounds that break down into isothiocyanates linked to cancer-fighting and anti-inflammatory properties in preliminary research. [source]
Pesticide-free food gardening
HouseholdQuick maturity and high yield per square foot make broccoli raab excellent for small-space organic vegetable gardens and container growing on patios or balconies. [source]
Beneficial insect habitat
WildlifeWhen allowed to flower, broccoli raab attracts pollinators like bees and parasitic wasps that control garden pests, supporting overall garden ecology. [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 primary head when buds are tightly closed and still green, typically 2-3 weeks after planting (before flowers open). Cut 4-6 inches down the stem with a sharp knife. Secondary side shoots will develop and can be harvested for another 2-4 weeks. Morning harvest offers best crispness. Do not wait for flowers to open, as they become tough and bitter.
Fun Facts
- 🌱 Broccoli raab is not a true broccoli variety but a leaf turnip relative; its scientific name indicates it's Brassica rapa, while broccoli is Brassica oleracea.
- 🌱 Known as 'rapini' in Italian and 'gai lan' in Cantonese, this vegetable has been cultivated in the Mediterranean and Asia for centuries but only gained popularity in North America in the last 30 years.
- 🌱 A single plant's secondary shoots can be harvested repeatedly for up to a month, making broccoli raab remarkably productive for its compact size and short growing season.
Gardening Terms
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