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How to Grow Purple Sprouting Broccoli

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Purple Sprouting Broccoli

Brassica oleracea var. italica

vegetable

Purple Sprouting Broccoli is a cold-hardy brassica that produces abundant small purple flower heads on side shoots rather than one large central head. It thrives in cool weather and is particularly valued for winter harvesting in temperate climates. This nutrient-dense vegetable offers a milder, slightly sweeter flavor than green broccoli when harvested after frost.

Looking for a specific variety?

Purple Sprouting Early Purple Sprouting Late Purple Sprouting Rudolph Red Arrow Claret

When should you plant Purple Sprouting Broccoli in your zone?

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Example Purple Sprouting Broccoli timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Purple Sprouting Broccoli

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Purple Sprouting Broccoli

    Around Aug 15

    ≈ 120 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Purple Sprouting Broccoli dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily minimum
💧
Water: Consistent moisture; 1-1.5 inches per week. Soil should remain evenly moist but not waterlogged. Increase watering during dry spells and before harvest.
📏
Spacing: 18 inches
📅
Days to maturity: 120-180 days from transplant
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Planting depth: 0.25-0.5 inches for seeds; transplants at same depth as container

Soil

Type: Well-draining, fertile loamy soil rich in organic matter
pH: 6.0-7.5
Amendments:
Compost Well-rotted manure Balanced fertilizer (10-10-10) Lime if pH below 6.0

Growing Zones

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Thrives in zones 3-9; exceptional winter harvests in zones 6-8

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

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Growth Stages

1

Seedling

4-6 weeks

First true leaves emerge after 7-10 days; seedlings are delicate with cotyledons and initial true leaf pairs

Maintain consistent moisture and 65-75°F temperature. Provide bright light to prevent leggy growth. Start indoors 4-6 weeks before transplanting.

2

Vegetative Growth

6-8 weeks

Plant develops 6-8 true leaves, establishing a sturdy root system and bushy structure without flower buds yet visible

Transplant outdoors when soil can be worked and temperatures stay above 50°F. Harden off for 7-10 days. Water consistently and side-dress with compost.

3

Pre-Flowering

4-6 weeks

Central stem elongates, plant grows larger, and buds begin forming on main and side shoots

Continue regular watering. Monitor for pests like cabbage worms. Apply row covers if needed. Cold exposure (vernalization) below 50°F triggers flowering in many varieties.

4

Flowering & Shoot Development

8-12 weeks

Small purple flower buds cluster on multiple side shoots; main head may also produce buds. Plant is hardy to frost

This stage often spans fall and winter. Light frosts improve flavor by converting starches to sugars. Provide protection in harsh conditions (row covers, cold frames). Keep soil moist.

5

Harvest

8-16 weeks of continuous harvesting

Purple shoots with tight buds are ready when 4-8 inches long, before flowers open; side shoots continue producing after main harvest

Harvest regularly to encourage more side shoots. Pinch or cut shoots at the base. Continue watering. In mild zones, harvest may extend into spring.

Companion Planting

Plan your garden →

Plant with:

Chamomile Dill Garlic Onion Beet Celery Chard Spinach Marigold Nasturtium

Avoid planting near:

Other brassicas (cabbage, cauliflower, kale) to prevent pest and disease spread Fennel Strawberry Pole beans Tomato

Common Pests

  • Row covers during planting; Bacillus thuringiensis (Bt) spray; hand-pick caterpillars; encourage beneficial wasps

  • Bt spray; neem oil; remove by hand; beneficial insects like parasitic wasps

  • Row covers on seedlings; neem oil or spinosad spray; reflective mulches

  • Strong water spray to dislodge; insecticidal soap; neem oil; encourage ladybugs and lacewings

  • Yellow sticky traps; insecticidal soap; neem oil; reflective mulches

  • Rotate crops; maintain pH above 6.0; remove infected plants; use resistant varieties if available

Uses

🍳

Steaming & Roasting

Culinary

Purple Sprouting Broccoli has a tender, sweet flavor ideal for steaming whole shoots for 4-5 minutes or roasting with olive oil until crispy. The entire shoot including stem is edible, unlike green broccoli crowns. [source]

🍳

Winter Greens & Soups

Culinary

Tender shoots can be blanched and added to soups, pasta dishes, and stir-fries, providing a nutrient boost during winter months when fresh vegetables are scarce. [source]

💊

Glucosinolate Content

Medicinal

Purple Sprouting Broccoli is rich in glucosinolates, sulfur-containing compounds converted to sulforaphane during digestion, known for potential anti-cancer and anti-inflammatory properties. [source]

🏠

Nutritional Powerhouse

Household

High in vitamin C, vitamin K, folate, and fiber. The purple pigmentation indicates anthocyanin antioxidants in addition to chlorophyll-based nutrients found in green varieties. [source]

🦋

Pollinator Support

Wildlife

If allowed to flower (past prime harvest), Purple Sprouting Broccoli's abundant purple flowers provide excellent late-season nectar and pollen for bees and beneficial 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 shoots when they are 4-8 inches long with tightly clustered purple buds, before flowers open. Cut or pinch shoots at the base to encourage branching and continued production. First shoots are typically ready 90-120 days after transplanting. Continue harvesting every 7-10 days throughout the season. Light frosts improve flavor. In zones 3-5, most harvest occurs late fall through early winter; in milder zones, harvesting can extend into spring.

Fun Facts

  • 🌱 Purple Sprouting Broccoli is actually a modern British invention from the 1980s, developed through crossing traditional purple sprouting varieties with modern broccoli genetics to improve yield and reliability.
  • 🌱 Unlike heading broccoli, Purple Sprouting produces continuous side shoots for weeks after the central shoot is harvested, making it one of the longest-producing brassicas in a home garden.
  • 🌱 The flavor actually improves after light frost—cold temperatures trigger the plant to convert starches into sugars as a natural antifreeze, making winter-harvested shoots sweeter and more tender than fall crops.

Gardening Terms

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

Compost Full Sun Row Cover Transplant True Leaves Vernalization
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