How to Grow Nine Star Perennial Broccoli
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Nine Star Perennial Broccoli
Brassica oleracea var. italica
vegetableNine Star Perennial Broccoli is a unique, cold-hardy brassica that produces multiple small broccoli heads over an extended season rather than a single large central head. Unlike annual broccoli varieties, it can persist for 3-5 years, returning year after year to produce numerous florets in spring and fall. This heirloom variety is prized by gardeners seeking perennial vegetable sources with minimal replanting.
When should you plant Nine Star Perennial Broccoli in your zone?
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Example Nine Star Perennial Broccoli timeline · Pittsburgh, PA (Zone 6b)
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Plant Nine Star Perennial Broccoli
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 Nine Star Perennial Broccoli
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Nine Star Perennial Broccoli dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-8; best in cooler climates with distinct seasons
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Seedling
4-6 weeksYoung plants with 2-4 true leaves, still tender and vulnerable
Start indoors 6-8 weeks before transplant. Keep soil consistently moist but not soggy. Provide bright light. Thin seedlings to prevent crowding.
Vegetative Growth
6-10 weeksPlant establishes strong root system and produces increasingly large leaves; no flower buds yet
Transplant outdoors after last frost. Water deeply and regularly. Apply mulch to retain moisture and suppress weeds. Monitor for cabbage worms. Fertilize every 2-3 weeks with balanced fertilizer.
Head Formation & Flowering
4-8 weeks (spring and fall)Multiple small broccoli heads (florets) develop at leaf axils and stem tips; appear as tight, green clusters
Maintain consistent watering; fluctuations cause bolting or loose heads. Remove any yellow or damaged leaves. Support heavy-producing plants with stakes if needed. Begin harvesting outer heads to encourage more production.
Peak Production
4-6 weeks per season; repeats annually in spring and fallPlant produces numerous harvestable heads simultaneously; can produce 8-12 smaller heads per season over multiple years
Harvest regularly to encourage continued production. Feed with nitrogen-rich fertilizer or compost tea. Deadhead any flowers that escape harvest to redirect energy. Monitor for pests.
Dormancy & Overwintering
Variable, 2-4 months depending on climatePlant slows or stops growth during hot summer and severe winter; foliage may die back in cold zones
In cold zones, mulch heavily (6-8 inches) after ground freezes to protect crown. Remove dead leaves. In warmer zones, provide afternoon shade and extra water in summer to prevent heat stress. Plant will regrow from base the following spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use row covers before moths appear. Hand-pick worms. Apply Bt (Bacillus thuringiensis) spray weekly. Encourage parasitic wasps with flowering plants.
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Remove by hand. Apply Bt spray or spinosad. Use yellow sticky traps. Maintain dense planting to discourage egg-laying.
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Use row covers on seedlings. Spray with neem oil or insecticidal soap. Mulch heavily to disrupt lifecycle. Maintain plant vigor with consistent watering.
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Spray with water to dislodge. Apply neem oil or insecticidal soap. Introduce ladybugs and lacewings. Remove heavily infested leaves.
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Ensure good drainage and pH above 6.0. Remove and destroy infected plants. Rotate brassicas to different beds for 7+ years. Solarize soil if severe.
Uses
Steaming, roasting, and fresh cooking
CulinaryNine Star heads are tender and sweet, excellent for steaming, roasting with olive oil, or adding to stir-fries. The smaller head size makes them ideal for individual portions and quick cooking. [source]
Extended harvest season
CulinaryThe perennial nature and multiple-head production means fresh broccoli can be harvested from spring through fall, extending your fresh produce season without replanting annually. [source]
Sulforaphane and anti-cancer compounds
MedicinalLike all broccoli, Nine Star contains glucosinolates that convert to sulforaphane, a compound studied for potential cancer-preventive and anti-inflammatory properties. [source]
Food security and homesteading
HouseholdAs a perennial crop requiring minimal replanting, Nine Star Broccoli is valuable for gardeners seeking greater food self-sufficiency and reduced annual seed/transplant costs. [source]
Pollinator and beneficial insect support
WildlifeAny flower buds allowed to bloom attract bees and other pollinators, supporting garden ecology. The dense foliage provides habitat for 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
Begin harvesting when heads are tight and green, 2-3 inches in diameter, before florets begin to flower. Cut with a sharp knife, leaving the stem and leaves intact—the plant will produce more heads from axillary buds. Main harvest season is spring (April-May) and fall (September-October) in most climates. Regular harvesting encourages continued production. Heads are most tender and flavorful in cool weather.
Fun Facts
- 🌱 Nine Star Perennial Broccoli can live 3-5 years or longer in ideal conditions, with well-established plants producing 8-12 harvestable heads per season—far more than conventional annual broccoli varieties.
- 🌱 Unlike standard broccoli that produces one large central head, Nine Star evolved to produce numerous smaller heads distributed along the stem, a strategy that spreads reproduction risk and extends the harvest season.
- 🌱 This variety was commercially available in England in the 1970s-1980s but nearly disappeared from cultivation; it has been revived by heirloom seed savers and is now experiencing renewed interest among permaculture and sustainable gardening enthusiasts.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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