Runner Bean
Phaseolus coccineus
Runner beans are one of the most productive and rewarding crops for UK allotments, producing heavy yields of long, flat-podded beans from July to October. They're also highly ornamental — the scarlet, white, or bicoloured flowers are attractive to bees and hummingbird hawk-moths, making them a dual-purpose crop. Traditional varieties like 'Scarlet Emperor' and 'Enorma' produce red flowers and long, tender pods, while 'White Lady' has white flowers and is said to set pods more reliably in hot weather. Grow them up a wigwam of 2.4m canes, a row of crossed canes, or along a fence or trellis. Sow seeds directly outdoors after the last frost (late May in most of the UK), or start indoors in late April for an earlier crop. Plant two seeds per cane, 5cm deep. They need rich, moisture-retentive soil — the traditional runner bean trench, dug in winter and filled with kitchen waste and compost, provides ideal conditions. Water copiously once flowering begins, as dry roots cause flowers to drop without setting pods. Pick pods regularly when 15–20cm long to keep the plants producing; any pods left to mature will signal the plant to stop flowering.
Plan where to grow Runner Bean using our vegetable garden planner.
When to Sow Runner Bean
Sow runner bean in April, May, June.
Time to Harvest Runner Bean
Expect to harvest approximately 3 months after sowing, usually from July to October.
Companion Plants for Runner Bean
- French Marigold
French marigolds draw in hoverflies whose larvae eat blackfly and aphids, and may help attract pollinators to the bean flowers.
- Courgette (Zucchini)
Courgettes sprawl at ground level beside the bean rows, shading the soil and holding moisture, a variation on the traditional 'three sisters'.
- Sweet Corn
Sweetcorn gives runner beans something to climb in the 'three sisters' system; plant the corn first so it is sturdy enough to take the beans' weight.
Expected Yield
Each plant can produce 2–3kg of pods over the season; a 2.4m double row of 20 plants yields enough for a family.
Growing Tips
Pick regularly to keep plants producing
Pruning Runner Bean
Pinch out the growing tips when plants reach the top of their supports to encourage side shoots lower down.
Common Problems with Runner Bean
Flowers dropping without setting pods
The most common frustration with runner beans. Caused by dry roots, hot temperatures above 30°C, or lack of pollinating insects. Water deeply and consistently once flowering starts — dry soil is the primary cause. Mist flowers in the morning during hot spells. 'White Lady' and 'Moonlight' set pods more reliably in heat.
Black bean aphid (blackfly)
Dense colonies of black aphids cluster on shoot tips and stems, weakening plants and causing distorted growth. Pinch out the growing tips once plants reach the top of their support — this removes the aphids' favourite feeding site and encourages side shoots. Spray severe infestations with organic soap-based insecticide.
Halo blight
Dark spots surrounded by a yellow halo appear on leaves, and greasy-looking spots on pods. A seed-borne bacterial disease worst in wet seasons. Remove and destroy affected plants. Buy certified disease-free seed, rotate crops, and avoid working among wet plants which spreads the bacteria.
Runner Bean: common questions
When should I sow runner bean in the UK?
Sow runner bean from April to June. Sow under cover for an early start, or directly outside once the soil has warmed.
How far apart should I plant runner bean?
Space runner bean about 15cm apart. It grows to around 2.4m tall. Sow seeds 5cm deep.
How long does runner bean take to germinate?
Runner Bean seeds usually germinate in 7–14 days, depending on temperature.
When is runner bean ready to harvest?
In the UK, runner bean is usually harvested from July to October. It's ready about 3 months after sowing.
Does runner bean come back every year?
Not in a typical UK garden. Runner Bean is a perennial in warmer climates but is killed by frost here, so it's grown as an annual and started again each year.
When should I prune runner bean?
Pinch out the growing tips when plants reach the top of their supports to encourage side shoots lower down.
What grows well with runner bean?
Good companions for runner bean include French Marigold, Courgette (Zucchini) and Sweet Corn. See the companion plants section above for why each one helps.
What should I not plant near runner bean?
Avoid garlic: alliums are traditionally kept away from peas and beans, which are said to grow less well beside them. Avoid onions: onions are traditionally kept away from peas and beans, which are said to grow less well beside them.
Is runner bean frost hardy?
No. Runner Bean is tender and is damaged by frost, so keep it under cover until all risk of frost has passed and bring it in, or grow it under glass, when nights turn cold.
What crop rotation group is runner bean in?
Runner Bean belongs in the legumes group for crop rotation. Grow it in a different bed each year, alongside other legumes, so pests and diseases don't build up in the soil.
Runner Bean guides
Plan your runner bean in the allotment planner
Drag and drop plants onto your plot and get personalised sowing reminders.
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