In the UK, sow French beans indoors in pots during April or May, or direct outdoors from late May once the soil is reliably warm — cold, wet soil rots the seed before it germinates. Harvest begins as early as July from indoor-raised plants, continuing through September.
Last updated 5 July 2026
Sowing dates, regional timing, and climbing vs dwarf variety picks for growing French beans successfully across the UK.
Ready to start growing? Read our full How to Grow French Beans UK → for technique, spacing, care and troubleshooting — this page is the quick timing reference for exact sowing and harvest dates.
Sowing dates and growing advice verified against RHS guidance by the SoilCommander Growing Team.
Sowing & Planting Dates
| Method | When | Notes |
|---|---|---|
| Sow indoors (pots) | Late April – mid-May | 5cm deep, one per pot; 18–21°C |
| Transplant outdoors | Late May – early June | After last frost; soil 12°C+; dwarf 15cm apart, climbers 20–25cm |
| Direct sow outdoors | Mid-May – mid-June | Soil reliably warm; cover with fleece if cold nights forecast |
| Succession sowing | Every 2–3 weeks, May – July | Keeps a continuous harvest going rather than one big flush |
| Latest sowing | Early July | Last realistic date for a crop before autumn frosts |
| Harvest begins | July (indoor-started) / Aug (direct) | Pick at 10–15cm every 2–3 days |
Regional Planting Notes
The Met Office notes that further north and over higher ground, “the average last frost often extends well into May and, in a few places, even into June.” In Scotland and northern England, wait until soil is reliably above 12°C before direct-sowing or planting out — rather than following the earlier end of the UK-wide window.
Dwarf vs Climbing
- Dwarf/bush varieties (e.g. The Prince, Safari): 45–60cm, no support, faster harvest (50–55 days), better for exposed northern gardens
- Climbing varieties (e.g. Cobra, Blue Lake): 1.5–2m, need cane support, heavier yields over longer season, ideal for small gardens using vertical space
Common Mistakes to Avoid
- Direct-sowing into cold, wet soil. Seed rots rather than germinates — wait until the soil is reliably warm before sowing outdoors.
- Ignoring slugs and black aphids on young plants. The RHS notes seedlings are vulnerable to slugs and snails, while black aphids colonise shoot tips — check plants regularly.
- Letting container plants dry out. Regular watering matters most for plants in containers, which dry out quickly, especially once flowering starts.
- Adding supports after sowing climbing varieties. Install canes or netting before sowing climbing types — retrofitting supports around established plants is far harder.
Frequently Asked Questions
Why won't my French bean seeds germinate?
Cold, wet soil is the usual cause — the seed rots before it can sprout. Wait until the soil is reliably warm, typically from late May.
How often should French beans be watered?
Water regularly, particularly plants in containers, which dry out quickly — consistent moisture matters most once flowering begins.
How do I stop slugs damaging French bean seedlings?
Check young plants regularly in the first few weeks; the RHS flags seedlings and young plants as especially vulnerable to slug and snail damage.
Can I keep sowing French beans through summer for a longer harvest?
Yes — sow a fresh batch every 2–3 weeks from May into early July to keep a continuous supply of pods rather than one large flush. Early July is the last realistic sowing date for a crop before autumn frosts arrive.
Plan Your French Bean Sowings
Get the soil-temperature-triggered sowing window (12°C, not before) for French beans, plus 38 other UK crops.
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