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Runner Bean

Phaseolus coccineus

VegetablesToxic

Vigorous climber with attractive red or white flowers and heavy pod production. Needs sturdy supports and regular picking.

Overview

SunFull Sun
WaterHighCalculate watering amount
Height150–300 cm
Spread30 cm
Spacing20 cm
Row Spacing60 cm
Germination7–14 days
To Harvest60–75 days

Companion Planting

Toxicity

SeverityMildly toxic
Toxic toHumans, Dogs, Cats

Raw seeds and pods contain phytohaemagglutinin (lectin), which can cause nausea, vomiting, and diarrhea; thorough cooking destroys the toxin and makes beans safe to eat.

Planting Tips

LocationFull sun to partial shade, sheltered from strong winds, with a sturdy support structure (trellis, poles, or wigwam) for climbing.
SoilRich, fertile, well-drained loamy soil amended with compost or well-rotted manure; pH 5.5-7.0.
Sowing Depth5 cm
Planting Depth5 cm
WateringWater deeply and consistently, about 2.5 cm per week, especially during flowering and pod set; water at the base to keep foliage dry.

1 cm of water per m² equals 10 liters. Use the Watering Calculator for exact amounts.

FertilizingMinimal fertilizer needed as runner beans fix nitrogen; apply compost or a low-nitrogen balanced fertilizer at planting time.

Care Tip: Pinch out growing tips once plants reach the top of their supports to encourage bushier growth and better pod production.

Common Pests

Black Bean Aphid

Symptoms: Dense colonies of small black insects on stems and shoot tips; curled, distorted leaves; sticky honeydew and sooty mold.

Treatment: Blast with a strong water jet, spray with insecticidal soap or neem oil, and encourage ladybirds and lacewings.

Prevention: Pinch out soft shoot tips once lower flowers appear; avoid excess nitrogen fertilizer that promotes lush growth.

Slugs and Snails

Symptoms: Irregular holes in leaves and stems, slime trails, and damaged or destroyed seedlings.

Treatment: Use beer traps, iron-phosphate slug pellets, or hand-pick at dusk.

Prevention: Apply copper tape or diatomaceous earth barriers around plants; keep the area free of debris.

Spider Mites

Symptoms: Fine webbing on leaf undersides, yellow stippling on leaves, and overall leaf browning in severe cases.

Treatment: Spray plants with water to raise humidity, apply insecticidal soap or neem oil.

Prevention: Mist foliage regularly in hot, dry weather and avoid water-stressed plants.

Common Diseases

Bean Rust

Symptoms: Small orange-brown raised pustules on leaf undersides and stems; leaves yellow and drop prematurely.

Treatment: Remove and destroy affected leaves; apply a sulfur- or copper-based fungicide at early onset.

Prevention: Practice crop rotation, space plants for good airflow, and avoid overhead watering.

Anthracnose

Symptoms: Dark, sunken spots on pods, stems, and leaves with pinkish spore masses in wet conditions.

Treatment: Remove infected plant material; apply copper-based fungicide if caught early.

Prevention: Use certified disease-free seed, rotate crops on a 2-3 year cycle, and avoid working among wet plants.

Halo Blight

Symptoms: Small water-soaked spots on leaves surrounded by a yellow halo; spots enlarge into brown, dry patches.

Treatment: No chemical cure; remove and destroy infected plants promptly to limit spread.

Prevention: Sow disease-free seed, avoid overhead irrigation, and do not handle plants when foliage is wet.