The short answer
Runner beans are easy and generous, but they are tender, so nothing goes outside until the frosts have passed. Give them a sunny, sheltered spot with rich, moist soil, put up tall supports before you start, sow from mid-April indoors or late May outdoors, and water well once they flower. Then pick the pods young every two or three days, which keeps the plant cropping for weeks.
Runner beans at a glance
One of the most productive crops you can grow, and one of the easiest: a few plants up a wigwam will keep a household in beans from mid-summer into autumn. They are not hardy, though, so the whole trick is warmth, water and regular picking.
| Runner beans | |
|---|---|
| Type | Tender climbing annual (Phaseolus coccineus), a legume |
| Sow indoors | Mid-April to May, in warmth |
| Sow or plant out | Late May to June, once the last frost has passed |
| Position | Full sun and shelter, rich moisture-retentive soil |
| Supports | 2.5m (8ft) canes, as a double row, A-frame or wigwam |
| Spacing | One plant per cane; canes 15-30cm (6-12in) apart |
| Harvest | Mid-summer to early autumn, picking every 2-3 days |
| Pick at | 20-25cm (8-10in) long, young and stringless |
Soil and supports
Pick a sunny, sheltered spot. Runner beans are hungry and thirsty, so weed the ground and fork in two bucketfuls of garden compost or well-rotted manure per square metre, ideally a few weeks before you sow or plant. If you garden no-dig, just spread a thick mulch and plant into that.
Climbing beans need tall, sturdy supports, and it is far easier to put them up before the plants are in. Use 2.5m (8ft) canes or hazel poles and build one of:
- A double row (A-frame): two rows of canes 45 to 60cm apart, the canes 15 to 30cm apart in each row, each pair tied near the top to a horizontal cane. Allow 1.5m between double rows.
- A wigwam: five or more canes in a circle, 15 to 30cm apart at the base, tied together at the top. Neat enough for a border or a big pot.
Dwarf varieties stay under 45cm and need no tall supports, just a few twiggy sticks to keep them off the soil. They suit small spaces and containers but crop less.
Sowing
Runner beans will not germinate in cold soil and the seedlings are killed by frost, so there is no rush. You can start them under cover for an early, reliable crop, or sow straight into warm ground.
- Indoors, mid-April to May: sow one bean 5cm (2in) deep into a deep module or small pot of peat-free multi-purpose compost, water well, and keep it warm and bright above 12C on a windowsill, in a propagator or greenhouse. This beats slugs and gives earlier, more reliable plants.
- Outdoors, late May to June: once all frost has passed and the soil has reached 12C (usually mid-May in the south, early June in the north), sow two beans 5cm (2in) deep at the base of each cane, then thin to the stronger one. Protect the seedlings from slugs and snails.
It is worth sowing a few spares, as losses to cold and slugs are common early on.
Planting out and care
Plant indoor-raised or bought plants out from late May or early June, once there is no risk of frost. Harden them off first, then set one plant at the base of each cane, water it in, and tie the stems loosely to get them climbing. They twine themselves up after that.
Through the season:
- Water generously, especially once the plants start to flower and set pods. This is the single biggest factor in a good crop. Plants in containers dry out fast and need watering often.
- Mulch around the roots with compost to lock in moisture and keep weeds down.
- Feeding is rarely needed in the ground; in pots, give a high-potassium liquid feed (such as tomato feed) every fortnight once flowering starts.
- Pinch out the tips when the plants reach the top of their canes. That stops them going top-heavy and pushes out side-shoots lower down, where you can reach the beans.
Harvesting
Picking starts around mid-summer and carries on for eight weeks or more. Pick the pods while they are young, tender and stringless, about 20-25cm (8-10in) long: they should snap cleanly, and the beans inside should still be small and pale. Home-grown beans picked young are a different thing entirely from the stringy ones in the shops.
When cropping finishes, cut the plants off at the base and compost the tops, but leave the roots in the ground. Like all peas and beans, runner beans fix nitrogen at their roots, so they leave the soil a little richer for next year.
Varieties to try
All runner beans crop well with the right care, but a few are worth seeking out, especially the self-fertile crosses if your summers run hot and dry (which can stop ordinary runners setting pods):
| Variety | Why grow it |
|---|---|
| 'White Lady' AGM | White flowers and stringless pods; copes better with heat |
| 'Enorma', 'Liberty' AGM | Reliable, heavy crops of long pods |
| 'Firelight', 'Moonlight', 'Stardust' | Runner and French bean crosses: self-fertile, set pods well in hot summers |
| 'Painted Lady' | Old favourite with red-and-white flowers, pretty enough for a border |
| Dwarf varieties (to 45cm) | No tall supports needed; good in small spaces and containers |
Common problems
- Frost kills young plants, so keep them under cover until it has passed.
- Slugs and snails go for young plants; raise them in pots and plant out at a decent size.
- Blackfly (black bean aphid) can build up on the shoots; pinching out the tips removes the worst of it, and it rinses off.
- No pods setting, common early in the season, is usually about dryness at the roots or hot weather. Water well, mulch, and choose a self-fertile variety in hot gardens.
- Rust (orange spots) and red spider mite can appear late or in warm, dry spells; keeping plants well watered helps.
Frequently asked questions
When should I sow runner beans?
Sow indoors in warmth from mid-April to May for an early, reliable crop, or sow outdoors from late May to June once all frost has passed and the soil has reached about 12C. Outdoor sowing is usually safe from mid-May in the south and early June in the north.
Why are my runner beans not setting pods?
Failure to set pods is a common early-season problem, usually caused by dry roots or hot, dry weather affecting pollination. Water generously once flowering starts, mulch to hold moisture, and in hot gardens grow a self-fertile runner/French cross such as 'Firelight', 'Moonlight' or 'Stardust'.
How tall do runner beans grow and what support do they need?
Climbing runner beans reach around 2.5m, so they need tall, sturdy supports put up before planting: a double row of canes tied into an A-frame, or a wigwam of five or more 2.5m canes. Dwarf varieties stay under 45cm and need only a few twiggy sticks.
How often should I pick runner beans?
Every two to three days once they start cropping. Pick the pods young and tender, about 20 to 25cm long, before they turn stringy. Regular picking keeps the plant flowering and producing; leaving pods to mature tells it to stop.
Can I grow runner beans in a pot?
Yes. Use a large container, at least 75cm wide and 45cm deep for climbing varieties, with a wigwam of canes, or a 30 to 45cm pot for a dwarf variety. Containers dry out quickly, so water often and feed every couple of weeks once flowering starts.
How we checked this2 sourcesView sourcesHide
Our guides draw on expert bodies like the RHS and Garden Organic, plus experienced growers, read at source. We check every guide against those sources on the date shown, and where advice differs between them, we say so. Garden Plans is published by Limely.
- AuthorityHow to grow runner beans, Royal Horticultural Society. Checked 22 Oct 2026.
- AuthorityHow to grow runner beans, Gardeners' World. Checked 22 Oct 2026.
