Sword Bean (Canavalia gladiata)

Sword Bean

Canavalia gladiata

Its sword-shaped pods hold cooked-edible seeds, a tropical legume with soft pea-like blooms. Annual herbaceous vine; common name: sword bean.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Requires 6–8 hours of direct sunlight daily for optimal pod production; tolerates partial shade in extreme summer heat
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Watering Keep soil consistently moist during active growth; avoid waterlogging to prevent root rot
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Temperature Thrives in warm tropical to subtropical temperatures; cannot tolerate frost or temperatures below 15°C
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Characteristics

  • Leaf: Trifoliate compound leaves with glossy ovate leaflets, 5–15 cm long
  • Flower: Pale lavender to white pea-like flowers in 10–20 cm racemes
  • Pod: Sword-shaped flat green pods, 15–30 cm long, containing 5–10 large brown seeds
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Horticulturist's Insider Field Notes (No AI Fluff)

The Golden 'Finger Test' Rule

Never water on a strict calendar. Stick your index finger 2 inches into the soil. If it feels cool and damp, wait 2–3 days. If bone dry, water thoroughly until it drains from the bottom holes.

Empty the Saucer After 20 Minutes

The #1 houseplant killer is water sitting in the catch tray. Stagnant runoff water starves roots of oxygen and causes root rot.

Turn the Pot Every 2 Weeks

Houseplants naturally lean toward the nearest window light. Give the pot a quarter-turn biweekly to maintain balanced, symmetrical architecture.

Wipe the Dust Away

Dust on leaves acts like a heavy sunshade. Gently wipe broad foliage with a damp cloth monthly to maximize photosynthesis and air purification.

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Care Guide

Watering

Water deeply when the top 2 cm of soil feels dry; maintain even moisture

Fertilization

Apply balanced organic fertilizer at planting. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of pod production

Composted banana peel tea:Steep fully composted banana peels in water for 3 days; dilute 1:20 for root drench; discard solid peels to avoid pest infestations and odors
Pruning
  • Trim trailing stems to encourage bushier growth and improve air circulation
  • Remove yellowing leaves and spent flower racemes to redirect energy to pod development
  • Cut back overgrown vines in mid-summer to maintain a manageable size on trellises
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Pet & Human Toxicity & Emergency Guide

⚠️ Toxic to Pets (Cats & Dogs)

Toxicity Warning: Veterinary toxicology registers Sword Bean (Canavalia gladiata) as possessing biochemical compounds (such as insoluble oxalates, alkaloids, or saponins) that pose ingestion hazards to felines and canines.

Feline Ingestion Risks (Cats)

Oral pain, hypersalivation (excessive drooling), pawing at mouth, swelling of tongue or lips, vocalization, and vomiting.

Canine Ingestion Risks (Dogs)

Oral mucosal irritation, gagging, retching, lack of appetite, lethargy, diarrhea, and difficulty swallowing.

Immediate Emergency First-Aid

Do NOT induce vomiting without veterinary instructions! Carefully remove remaining plant pieces, gently rinse mouth with cool water, and monitor breathing.

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Chewed leaf or stem? Open PlantFun App to scan the plant, immediately verify the botanical species, and view ASPCA toxicity severity ratings & vet first-aid advice.

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Troubleshooting & Common Plant Problems

Quick diagnostic guide for common care issues affecting Sword Bean (Canavalia gladiata):

Yellowing Leaves

Most commonly caused by overwatering or poor drainage. Ensure topsoil dries out between waterings and check for root ventilation.

Brown or Crispy Leaf Tips

Low ambient humidity, hard tap water minerals, or direct midday sunburn. Increase humidity and use filtered water.

Drooping or Wilting Foliage

Indicates dehydration or root damage from prolonged waterlogging. Inspect soil moisture and root firmness.

Common Pests (Spider Mites, Aphids)

Dry indoor air encourages pests. Wipe leaves with a damp cloth and treat with insecticidal soap or neem oil.

🌿 Instant AI Plant Health Check

Take a photo of any leaf on PlantFun App to get instant diagnosis of diseases, pests, and custom care recovery steps.

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Propagation & Repotting Guide

  • Taking Cuttings: During active spring or summer growth, take a healthy 4–6 inch cutting just below a node using clean shears.
  • Rooting Medium: Place cuttings in fresh water or moist perlite mix in bright, indirect light; refresh water weekly.
  • Potting Up: Transplant into well-draining potting mix once roots reach 2 inches in length (typically 3–5 weeks).
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Seasonal Care Calendar

  • Spring & Summer (Active Growth): Water thoroughly as topsoil dries; apply diluted balanced fertilizer monthly; encourage steady growth.
  • Autumn (Transition): Gradually reduce watering frequency as daylight hours shorten; discontinue fertilization.
  • Winter (Dormancy): Water sparingly only when soil is mostly dry; protect from cold window drafts; keep in warm room.
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Frequently Asked Questions

How often should I water my Sword Bean?

Water thoroughly when the top 1–2 inches of soil feel dry. In active growth (spring/summer), water every 1–2 weeks; reduce significantly in winter.

Where is the best indoor location for Sword Bean?

Position in bright, filtered indirect light (e.g., near an east or south-facing window with sheer curtains). Avoid harsh direct midday sun.

Is Sword Bean toxic to pets?

ASPCA: Ingestion of raw seeds may cause gastrointestinal upset

When should I repot my Sword Bean?

Repot every 1–2 years in spring when roots outgrow the drainage holes or the soil depletes nutrients.

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Garden Uses & Culture

Culture: Used in traditional Asian folk medicine for its anti-inflammatory properties when seeds are properly processed

Usage: Cooked seeds as a protein source; ornamental vining plant for trellis decoration

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