How to grow snake bean
Overview
Snake bean (Vigna unguiculata subsp. sesquipedalis) is a heat-loving legume grown for its exceptionally long, tender pods. It is a vigorous climbing plant that benefits from regular picking to sustain heavy yields. Provide a strong trellis and warm soil for best results.
Varieties
- Red Noodle — Vibrant purple pods that turn green when cooked; heat-tolerant and productive.
- Snake Bean (Green) — Standard dark green, very long pods, reliable and widely grown in Australia.
- Asian Long Bean — Thin, light green pods up to 60 cm; popular in stir-fries, excellent heat tolerance.
- Sita — Bush type (semi-determinate) for smaller gardens; pods 30–40 cm, good in temperate zones.
Soil Preparation
Prefers well-drained, fertile loam with pH 6.0–7.0. Dig in aged compost or well-rotted manure before planting. Avoid fresh nitrogen-rich fertilisers as they encourage leaf growth at the expense of pods.
Growing Guide
Sow seeds 2 cm deep, 30 cm apart, into well-warmed soil after all frost risk. Use a sturdy trellis, teepee, or fence at least 2 m tall. Water consistently to keep soil evenly moist but not waterlogged. For bushier growth, pinch out the main stem when it reaches the top of the support.
Sowing
Direct sow 2–3 seeds per spot, 2 cm deep, 30 cm apart in rows 90 cm apart. Thin to the strongest seedling. Germination takes 7–14 days. Soak seeds for 4 hours in warm water to speed germination. Do not transplant – root disturbance reduces vigour.
Care
Apply a balanced fertiliser (low in nitrogen) every 4 weeks during active growth. Train new tendrils onto the trellis. Remove yellowing lower leaves to improve airflow and reduce disease. Ensure the trellis is firmly secured before vines reach full weight.
Companion Planting
Grow snake bean with corn, cucumbers, squash, and okra to share trellis or create microclimate. Avoid all members of the allium family (onion, garlic, leek) as they can stunt its growth. Also avoid fennel.
Common Pests & Risks
Aphids and mites can be treated with neem oil or insecticidal soap. Bean fly (Ophiomyia phaseoli) causes stem swelling; control with yellow sticky traps or reflective mulch. In humid conditions, pod borers may attack; remove infested pods promptly.
Harvesting
Pick pods when they are 30–45 cm long, still thin and before seeds begin to bulge. Harvest every 2–3 days to encourage more flowering and pod production. Use scissors or snip gently to avoid damaging vines.
In the Kitchen
Snake beans are best eaten fresh, stir-fried, steamed, or added to curries. They can be stored in the fridge for 3–5 days in a perforated bag. Blanch and freeze for longer storage; they retain texture better than other beans.
Troubleshooting
Poor pod set: heat stress or low pollinator activity – shade flowers during extreme heat, hand pollinate. Yellow lower leaves: overwatering or nitrogen deficiency – allow soil to dry slightly, side-dress with compost. Stunted growth: soil too cold – wait until soil reaches 20°C. Bean fly damage: stem swelling, wilting – apply imidacloprid drench at seedling stage or use floating row cover. Pods curling/blemished: inconsistent watering – mulch after planting and maintain even moisture.