How to Grow Legumes (Clitoria and Desmodium)
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Legumes (Clitoria and Desmodium)
Clitoria ternatea L., Desmodium species (D. intortum, D. uncinatum, D. heterophyllum)
herbClitoria ternatea (butterfly pea) and Desmodium species are nitrogen-fixing legumes used as cover crops, green manure, and forage plants. These tropical to subtropical perennials form symbiotic relationships with rhizobial bacteria to convert atmospheric nitrogen into plant-available forms, enriching soil naturally. Both are valued in sustainable agriculture for soil improvement, erosion control, and livestock feed.
When should you plant Legumes (Clitoria and Desmodium) in your zone?
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Example Legumes (Clitoria and Desmodium) timeline · Pittsburgh, PA (Zone 6b)
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Plant Legumes (Clitoria and Desmodium)
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 Legumes (Clitoria and Desmodium)
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-12; can be grown as annual in zones 7-8 with protection
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Get my Legumes (Clitoria and Desmodium) timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds emerge in 7-14 days with cotyledons visible. True leaves unfold, showing characteristic pinnate or trifoliate foliage.
Keep soil consistently moist but not waterlogged. Ensure good drainage to prevent damping off. Inoculate seeds or seedlings with appropriate Rhizobium strain before planting if using unfamiliar soil.
Vegetative Growth
4-8 weeksVigorous foliage development; climbing or trailing growth habit emerges (especially in Clitoria). Plant builds biomass and root nodules form.
Minimal fertilizer needed; excess nitrogen suppresses nodulation. Provide support/trellis for Clitoria if desired. Monitor for pests but avoid broad-spectrum pesticides that kill beneficial bacteria.
Flowering
6-12 weeks (continuous in warm climates)Clitoria produces striking bright blue, pink, or white butterfly-shaped flowers on climbing vines. Desmodium bears smaller clustered flowers in white, pink, or purple.
Flowering indicates active nitrogen fixation. Continue moderate watering. Allow flowers to develop fully for maximum seed production and nitrogen accumulation.
Seed Set & Maturation
4-8 weeksLegume pods form and mature. Biomass accumulates and nitrogen content in plant tissue increases substantially.
Reduce watering slightly to concentrate nutrients. Leave plants to mature fully before incorporation or harvest to maximize nitrogen fixed.
Incorporation/Senescence
Ongoing as annual or 12+ months as perennialPlant dies back or is cut and incorporated into soil as green manure. Decomposition releases fixed nitrogen into soil.
Cut 2-3 weeks before planting next crop to allow decomposition and nitrogen release. Incorporate into top 4-6 inches of soil. Inoculate next crop if planting non-legume to restore nodule-forming bacteria.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Proper seed storage in sealed containers; avoid infested seed sources; remove infected pods immediately
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Usually minor; hand-pick in small plots; spinosad spray if severe; row covers for seedlings
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Spray with neem oil or insecticidal soap; encourage beneficial insects; parasitic wasps
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Copper tape barriers; diatomaceous earth; encourage ground beetles and ground-dwelling predators
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and
(fungal)
Ensure good air circulation; avoid overhead watering; sulfur dust in humid climates; remove infected foliage
Uses
Butterfly Pea Tea & Dye
CulinaryClitoria flowers produce a vibrant blue tea with antioxidant properties; the color changes to purple when acidified with lime. Edible flowers add striking visual appeal to dishes. [source]
Herbal & Cognitive Support
MedicinalButterfly pea has been used in traditional medicine for memory enhancement, anxiety reduction, and anti-inflammatory benefits. Desmodium species are used in herbal preparations for liver support and respiratory health. [source]
Nitrogen Fixation & Soil Improvement
HouseholdBoth species fix atmospheric nitrogen through symbiotic rhizobial relationships, naturally enriching soil without synthetic fertilizer. Incorporation as green manure adds organic matter and reduces need for nitrogen amendments in following crops. [source]
Pollinator & Forage Habitat
WildlifeFlowers attract bees, butterflies, and beneficial insects. Both species are valuable forage for livestock (cattle, goats, sheep) and wildlife; Desmodium is particularly nutritious for ruminants. [source]
Natural Dye Source
CraftClitoria flowers yield blue to purple dyes used in textile crafting. The pigment (anthocyanin) is responsive to pH, creating a full spectrum of colors from blue to pink to purple. [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 green manure: cut 2-3 weeks before planting next crop (optimal nitrogen release), typically 4-6 months after establishment. For seed: allow pods to mature, turn brown, and dry on plant; harvest when pods are brittle and seeds rattle inside. For fresh forage: cut leaves and stems when flowering begins. For Clitoria flowers: harvest blooms in early morning when they open; use fresh or dry immediately.
Fun Facts
- 🌱 Clitoria ternatea earned its scientific name from the flower's resemblance to the human clitoris; it's also called 'butterfly pea' and 'bluebells' to avoid awkwardness in gardening catalogs.
- 🌱 A single legume plant can fix 50-100+ kg of nitrogen per hectare per year through its root nodules—equivalent to commercial nitrogen fertilizer applications—making it one of the most cost-effective soil amendments.
- 🌱 Desmodium is a 'trap crop' for herbivorous insects; it attracts pests away from nearby crops while simultaneously improving soil fertility—a dual-benefit companion planting strategy gaining popularity in African and tropical agriculture.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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