How to Grow Butterfly Pea

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Butterfly Pea

Centrosema pubescens

vine

Centrosema pubescens is a tropical perennial climbing vine known for its striking blue to purple butterfly-shaped flowers and nitrogen-fixing capabilities. Native to tropical regions of the Americas, it is widely cultivated as a cover crop, forage plant, and ornamental in tropical and subtropical climates. The plant produces attractive flowers followed by long, slender seed pods and is valued for soil improvement and wildlife attraction.

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Example Butterfly Pea timeline · Pittsburgh, PA (Zone 6b)

Plant Butterfly Pea
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest Butterfly Pea
Around Jun 16

≈ 60 days after planting

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

Growing Conditions

☀️

Sun: Full sun, 6-8 hours daily minimum; prefers bright, unobstructed light

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Water: Moderate watering; drought-tolerant once established. Prefers slightly moist soil during growing season but tolerates dry conditions. Reduce watering in winter dormancy period.

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Spacing: 12-18 inches between plants; allows adequate air circulation and room to climb inches

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Days to maturity: 60-90 days to first flowering

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Planting depth: 0.5 inches for seeds; plant transplants at same depth as container

Soil

Type: Well-draining sandy loam to loamy soil; tolerates poor, marginal soils well

pH: 5.5-7.5

Amendments:

Organic matter or compost at planting Phosphorus for flowering promotion Minimal nitrogen (fixes its own nitrogen)

Growing Zones

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Thrives in zones 10b-12; can be grown as annual in cooler zones

10b 11a 11b 12a 12b

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Growth Stages

Germination & Seedling

2-3 weeks

Seeds germinate in 7-14 days; seedlings develop first true leaves and tender stems

Soak seeds 24 hours before planting to improve germination. Keep soil consistently moist but not waterlogged. Provide bright, indirect light. Thin seedlings to prevent crowding.

Vegetative Growth

4-6 weeks

Plant establishes climbing vine with multiple stems and compound leaflets; foliage develops rapidly

Provide trellis, stakes, or support structure early. Water moderately and allow soil to dry between waterings. Minimal fertilizer needed; excess nitrogen reduces flowering. Prune to encourage branching if desired.

Flowering

8-16 weeks (continuous in tropical climates)

Distinctive blue to purple butterfly-shaped flowers appear singly or in small clusters along the vine; blooms are 1-1.5 inches across

Maintain consistent watering without waterlogging. Deadhead spent flowers to encourage continued blooming. Ensure adequate sunlight for prolific flowering. Avoid excessive nitrogen fertilizer.

Fruiting & Seed Development

4-8 weeks after flowering

Flowers develop into long, slender legume pods (3-6 inches) containing 5-15 seeds; pods mature from green to brown

Allow flowers to set seed naturally. Do not remove all seed pods if planning for self-seeding or seed collection. Pods can be left on plant for natural dispersal.

Senescence

Variable; begins with temperature drop in fall

In non-tropical climates, plant declines with cooling temperatures; in tropical regions, enters dormancy or continues growth year-round

In seasonal climates, collect seeds before frost if desired. Cut back plant after frost or at end of growing season. In tropics, minimal pruning needed unless plant becomes overgrown.

Companion Planting

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Plant with:

Corn Beans Squash Cowpea Okra Cassava Taro Nitrogen-demanding crops

Avoid planting near:

Allelopathic plants that inhibit legume growth Dense shade-producing trees Plants requiring high nitrogen fertilization (as this vine's nitrogen fixation may create imbalance)

Common Pests

Increase humidity; spray foliage with water; use neem oil or insecticidal soap if severe
Yellow sticky traps; neem oil spray; ensure good air circulation
Hand-pick if few; use Bacillus thuringiensis (Bt) for heavy infestations
Remove affected pods; encourage natural predators; minimal chemical intervention needed
and
Copper barriers; handpicking; organic slug baits if necessary

Uses

🍳

Edible Flowers & Nutritious Forage

Culinary

The bright blue flowers are edible and used in salads, tea, and garnishes in Southeast Asian and Caribbean cuisines. The young leaves and shoots are nutritious and used as a potherb in some traditional cultures. [source]

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Traditional Herbal Remedy

Medicinal

Used in traditional medicine systems, particularly in Southeast Asia, for blood sugar management and as a general tonic. Modern research explores its potential antioxidant and antidiabetic properties. [source]

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Cover Crop & Nitrogen Fixation

Household

As a legume with nitrogen-fixing nodules, it improves soil fertility and is used in sustainable agricultural systems, intercropping, and erosion control. It can enhance soil organic matter when incorporated. [source]

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Pollinator & Wildlife Support

Wildlife

The distinctive blue flowers attract bees, butterflies, and other pollinators. Provides food sources in tropical gardens and supports beneficial insect populations. [source]

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Natural Dye & Ornamental Use

Craft

The flowers produce blue pigments that can be extracted for natural dyes. Widely grown as an ornamental climbing vine in tropical and subtropical gardens for its striking flowers. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

For forage/cover crop: Cut vines at 4-6 weeks of age before flowering for highest protein content. For flowers: Pick in early morning when fully open for ornamental use; flowers are edible with mild, slightly sweet flavor. For seeds: Allow pods to mature and brown on plant; harvest when pods are dry and brittle; store seeds in cool, dry location. Plant is productive and can be harvested multiple times per season in tropical climates.

Fun Facts

🌱 The flowers change color subtly throughout the day, often deepening in hue as they age, creating a dynamic visual display on the vine.
🌱 Centrosema pubescens is also called 'Butterfly Pea Flower' and is the source of the brilliant blue pigment used in some high-end beverages and teas, including blue 'butterfly pea flower tea' popular in Southeast Asia.
🌱 The plant has significant agricultural importance in tropical and subtropical regions as a protein-rich forage crop for livestock and as a sustainable nitrogen source in low-input farming systems, particularly in Africa, Asia, and Latin America.

Gardening Terms

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

Cover Crop Deadhead Full Sun Germination Perennial Trellis True Leaves

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