How to Grow Sword Bean
Sword Bean
Canavalia gladiata
vegetableSword bean is a vigorous tropical climbing legume that produces long, flat, sword-shaped green pods containing large seeds. Native to tropical Africa and now cultivated throughout Asia and the Pacific, it is prized for its nutritious immature pods and mature seeds. The plant is also valued as a green manure crop for nitrogen fixation.
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Example Sword Bean timeline · Pittsburgh, PA (Zone 6b)
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Plant Sword Bean
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 Sword Bean
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Sword Bean dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9b-12; grown as an annual in cooler climates during warm season
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Germination
10-14 daysSeed germinates and seedling emerges with cotyledons; first true leaves appear.
Keep soil warm (70-80°F) and consistently moist. Provide strong light. Thin to strongest seedling if crowded.
Vegetative Growth
4-6 weeksRapid growth with multiple stems developing; vining begins. Plant produces abundant foliage and establishes root system.
Install sturdy trellis or support early (plants can reach 6-10 feet). Mulch around base to retain moisture and moderate soil temperature. Side-dress with compost mid-season.
Flowering
3-4 weeksDense clusters of small white, pink, or purple flowers appear along the vines; blooming is profuse.
Ensure consistent watering and phosphorus availability (avoid excess nitrogen which favors foliage over flowers). Keep area weed-free. Flowers are self-pollinating but attract pollinators.
Pod Development
2-3 weeksFlowers set pods that rapidly elongate into characteristic flat, sword-shaped green pods reaching 8-16 inches long.
Maintain steady moisture and warmth. Pods are ready for immature harvest (tender, snap-stage) within 2-3 weeks of flowering.
Maturation & Harvest
4-8 weeksPods mature, turn yellow-brown or dry, and become tough. Seeds inside enlarge and harden, turning brown or mottled.
Allow pods to fully dry on vine if harvesting for seeds. Harvest immature pods regularly to encourage continued production. For seed harvest, pick pods when dry and shell indoors.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Handpick early instars; use row covers on seedlings; apply neem oil or spinosad if populations are high
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Spray with water to dislodge; use miticide or insecticidal soap if severe; maintain adequate humidity
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Store dried seeds with food-grade diatomaceous earth or in freezer; infested seeds can be heat-treated or discarded
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Use yellow sticky traps; spray with insecticidal soap or neem oil; encourage natural predators
Uses
Immature pod vegetable
CulinaryTender young pods are cooked and eaten similar to snap beans or okra, with a mild flavor. Popular in Southeast Asian and Pacific Island cuisines, they can be steamed, stir-fried, boiled, or added to curries and soups. [source]
Seed protein source
CulinaryMature dried seeds are cooked like beans (beans, legume-based dishes) and provide high protein. Seeds must be boiled thoroughly as raw seeds contain antinutritional compounds. [source]
Traditional medicine uses
MedicinalIn traditional Asian medicine, sword bean is used to support respiratory and digestive health. The plant has been studied for antitrypsin compounds relevant to health. [source]
Green manure and nitrogen fixation
HouseholdAs a legume, sword bean fixes atmospheric nitrogen through root nodules, enriching soil for subsequent crops. Often used as a cover crop or green manure in sustainable agriculture. [source]
Pollinator support
WildlifeAbundant flowers attract bees and other pollinators, making the plant valuable for supporting pollinator populations in tropical and subtropical gardens. [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 immature pods (most common culinary use), harvest when pods are 6-8 inches long and still tender, about 2-3 weeks after flowering. Harvest regularly to stimulate continuous flowering. For mature seeds, allow pods to fully mature and dry on the vine, then harvest and shell. Seeds may be dried and stored for months in cool, dry conditions.
Fun Facts
- 🌱 Sword bean pods can grow to 16 inches long and resemble flat swords, giving the plant its common name.
- 🌱 The plant is a nitrogen-fixing legume that was historically used in tropical agriculture as a 'green manure' crop to naturally enrich soil between plantings.
- 🌱 Sword bean is known by many names across the world: 'winged bean' in some regions, 'asparagus pea' (though technically a different plant), and 'dragon bean' in various Pacific Island nations.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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