Direct-sow runner beans outdoors once soil reaches 12°C — usually mid-May in southern England and early June further north. For an earlier start, sow indoors April–May and plant out after the last frost. Harvest runs July to October, picking young pods every two to three days.
A quick SoilCommander video on growing runner beans at home in UK conditions — sowing, spacing, care and harvest in under a minute.
Last updated 3 July 2026
Runner beans are a classic British vegetable, beloved for their prolific crops, attractive flowers, and delicious flavour.
Not sure when to sow? See our When to Plant Runner Beans UK →
Sowing dates and growing advice verified against RHS guidance by the SoilCommander Growing Team.
Part of the UK Vegetable Growing Guides — how-to-grow guides for every crop.
Sowing & Planting Dates
| Task | Timing | Notes |
|---|---|---|
| Sow indoors | April – May | 5cm deep in pots; grow on under cover |
| Sow/plant outdoors | May – June | Direct-sow only once soil reaches 12°C (mid-May south, early June north); transplant raised seedlings after hardening off |
| Harvest | July – October | Pick pods at 20–25cm every 2–3 days |
Regional Planting Notes
The RHS puts outdoor sowing at "mid-May in the south of the UK and early June in the north", since the soil needs to reach 12°C. In Scotland and other cooler regions, indoor sowing in April–May gives plants a longer effective growing season before the shorter outdoor window opens. This matches the Met Office's own data showing the last frost lingering "well into May and, in a few places, even into June" in northern and upland areas.
Quick Growing Facts
- Sowing Time: April to June (indoors from April; outdoors from May)
- Harvest Time: July to October
- Difficulty: Easy
- Position: Full sun, sheltered from strong winds
Key Growing Tips
- Soak seeds overnight before sowing to speed germination
- Install 2.4m+ supports before or at sowing time
- Water generously when flowering — drought causes flower drop
- Pick every 2–3 days at 15–20cm; leaving pods mature stops production
Common Runner Bean Mistakes
- Sowing outdoors too early — below 12°C soil, seeds rot before germinating; wait for mid-May (south) / early June (north) or start indoors instead.
- Letting soil dry out once flowering starts — this is the leading cause of flowers dropping without setting pods; water regularly through the flowering and cropping period.
- Spacing plants too close — RHS recommends around 30cm between plants; overcrowding weakens climbing growth and cuts yield.
- Leaving pods to mature on the plant — this signals the plant to stop producing; pick every 2–3 days at 20–25cm for continued cropping.
- Using flimsy supports — a full crop is heavy; RHS-style double rows use 2.5m canes or poles, sloped inward and tied at the top.
Top Varieties
- Enorma — RHS AGM, very long pods, excellent flavour
- Polestar — stringless, smooth pods, heavy cropper
- White Lady — AGM, white-flowered, less attractive to birds
Frequently Asked Questions
When should I sow runner beans in the UK?
Direct-sow outdoors once soil reaches 12°C — mid-May in southern England, early June further north, per RHS guidance. For an earlier crop, sow indoors April–May and transplant after the last frost.
Why aren't my runner bean flowers setting pods?
Failure to set pods is a known early-season issue, often linked to dry soil or cool nights during the first flush. Keep the soil consistently moist and mulch to retain moisture; pod set usually improves as the weather warms into the main flowering flush.
How far apart should runner beans be spaced?
RHS spacing is around 30cm between plants, with canes 15–30cm apart within the row and 45–60cm between double rows of supports.
How do I support runner beans?
The traditional method is a double row of 2.5m bamboo canes or hazel poles, sloped inward and tied at the top. X-frames or wigwams work well in smaller spaces.
Browse all sowing dates: UK vegetable planting calendar · All guides: UK vegetable growing guides
Tools That Help With This Crop
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Use the printable UK Vegetable Garden Planner to turn this guide into sowing dates, bed layouts, and weekly garden tasks.