How to Grow Brassica Rabe

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Brassica Rabe

Brassica rapa subsp. rapa var. rapa

vegetable

Brassica rabe, commonly known as rapini or broccoli rabe, is a leafy green cruciferous vegetable with small broccoli-like florets and tender stems. It has a slightly bitter, peppery flavor and is popular in Italian and Asian cuisines. The entire plant—florets, stems, and leaves—is edible and nutritious.

Looking for a specific variety?

Rapini Spring Raab Italian Green Sprouting Spigarello Sessantina Grossa Broccoli di Ciccio

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Example Brassica Rabe timeline · Pittsburgh, PA (Zone 6b)

Plant Brassica Rabe
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Brassica Rabe
Around May 27

≈ 40 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Brassica Rabe dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade in hot climates

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Water: Keep soil consistently moist (1-1.5 inches per week); avoid waterlogging; water at soil level to prevent fungal issues

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Spacing: 6 inches

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Days to maturity: 40-100 days depending on variety and season; typically 50-70 days

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Planting depth: 0.5 inches for direct seeding; transplants at soil line

Soil

Type: Well-draining loamy soil rich in organic matter

pH: 6.0-7.5

Amendments:

Compost or aged manure Nitrogen-rich fertilizer Bone meal for phosphorus Kelp meal for trace minerals

Growing Zones

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Cool-season crop thriving in zones 3-9; best in zones 5-8 for spring and fall harvests

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

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Growth Stages

Seedling

2-3 weeks

Cotyledons emerge within 5-10 days; first true leaves are heart-shaped and serrated

Maintain consistent moisture and warmth (60-70°F). Thin seedlings to proper spacing once 2-3 true leaves appear. Protect from damping off with good air circulation.

Vegetative Growth

3-4 weeks

Plant develops multiple deeply lobed leaves in a rosette pattern; stem thickens and branches begin forming

Fertilize every 2-3 weeks with balanced nitrogen-rich fertilizer. Monitor for cabbage moths and aphids. Keep soil evenly moist. Mulch to retain moisture and regulate soil temperature.

Flowering & Budding

1-2 weeks before harvest

Central flower head with small green buds forms at the top; multiple side shoots develop with smaller buds

This is the ideal harvest stage. If left unharvested, buds will open into small yellow flowers. Continue watering and monitor for pests closely as plants attract cabbage family insects.

Primary Harvest

1 week (intensive harvest window)

Main central floret head reaches 2-4 inches, with tender stems and leaves at peak quality; florets are still tight and green

Harvest the central head by cutting 1-2 inches below the lowest floret. Leave the plant in place—it will produce secondary side shoots. Continue watering and fertilizing.

Secondary Production

3-4 weeks

Plant produces multiple smaller side shoots with florets along the stem over several weeks after main head removal

Continue harvesting side shoots as they reach 4-6 inches long. Regular harvesting encourages more production. Maintain fertility and moisture. Plant becomes less productive in heat.

Companion Planting

Plan your garden →

Plant with:

Beets Carrots Celery Dill Garlic Lettuce Onions Potatoes Spinach Swiss chard Thyme

Avoid planting near:

Fennel Kohlrabi Mustard Other brassicas (same family—risk of pest and disease concentration) Strawberries Tomatoes

Common Pests

Row covers over young plants; Bt (Bacillus thuringiensis) spray; hand-pick caterpillars; netting to exclude butterflies
Bt spray; spinosad; hand-removal of caterpillars; encourage parasitic wasps
Spray with water to dislodge; neem oil; insecticidal soap; encourage ladybugs and lacewings
Row covers on young plants; kaolin clay spray; neem oil; trap crops like mustard nearby
Crop rotation (3-4 years away from brassicas); lime soil to raise pH; remove infected plants; solarize soil if severely affected
Ensure good air circulation; avoid overhead watering; sulfur dust or fungicide spray; remove infected leaves promptly

Uses

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Italian & Asian Cooking

Culinary

Rapini is a staple in Italian cuisine, especially sautéed with garlic and olive oil, and widely used in Chinese stir-fries and soups. The entire plant—florets, stems, and leaves—is edible and prized for its tender texture and slightly bitter, peppery flavor. [source]

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Glucosinolates & Detoxification

Medicinal

Brassica rabe is rich in glucosinolates, sulfur compounds that break down into isothiocyanates when chewed or cooked. These compounds have been studied for potential anti-cancer and liver-supporting properties. [source]

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Nutritional Powerhouse

Culinary

Exceptionally high in vitamins A, C, and K, calcium, and iron. One serving provides substantial daily value of multiple micronutrients with very few calories. [source]

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Sustainable Succession Harvesting

Household

The extended side-shoot production after central head removal means a single planting provides multiple harvests over 4-6 weeks, maximizing garden productivity and providing fresh greens throughout the season. [source]

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Pollinator & Beneficial Insect Attraction

Wildlife

If allowed to flower, brassica rabe attracts bees, hoverflies, and parasitic wasps that prey on garden pests. The small yellow flowers are a valuable early-season nectar source. [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 central head when buds are still tight and green, before flowers open (typically 50-70 days from planting). Cut 1-2 inches below the lowest floret with a sharp knife. Leave the plant rooted; side shoots will develop and can be harvested over the next 3-4 weeks as they reach 4-6 inches long. Morning harvest after dew dries yields the crispest product. Brassica rabe is a cool-season crop and becomes bitter and bolts quickly in heat above 75°F; plan spring crops for early harvest before heat and fall crops for post-heat harvest.

Fun Facts

🌱 Brassica rabe is not a cross between broccoli and another plant, despite its common name 'broccoli rabe'—it's a distinct subspecies of turnip (Brassica rapa) with a different plant structure and no genetic relationship to broccoli (Brassica oleracea).
🌱 In Italy, rapini is called 'cime di rapa' (turnip tops) because it was traditionally grown primarily for its greens, with the roots used separately as a vegetable.
🌱 The plant is exceptionally fast-growing and cold-hardy, making it ideal for spring and fall gardens where it often outpaces other crops; some varieties mature in as little as 40 days.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Bolt Damping Off Full Sun Mulch Partial Shade pH True Leaves

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