vegetable
legume family

French Bean

Phaseolus vulgaris

French beans (also called green beans or string beans) are a warm-season staple that produce slim, tender pods with a finer flavour and texture than runner beans. Dwarf (bush) varieties grow 45cm tall and need no support, making them ideal for smaller plots and containers, while climbing types reach 2m and produce heavier yields over a longer season. Sow directly outdoors from mid-May once the soil has warmed to at least 12°C, or start in pots indoors from late April. They're less fussy than runner beans — they don't need the rich, moisture-retentive trench, though they appreciate fertile, well-drained soil. Unlike runners, French beans are self-pollinating, so flower drop in hot weather is rarely an issue. Harvest dwarf varieties from July, climbers from August. Pick pods when young and pencil-thin (10–15cm) for the best flavour and to encourage continuous production. Popular dwarf varieties include 'The Prince' and 'Safari'; for climbers, 'Cobra' and 'Blue Lake' are excellent. Purple-podded varieties like 'Purple Teepee' are easy to spot among the foliage, though they turn green when cooked. Surplus beans freeze well — blanch for 2 minutes, cool, and freeze flat on trays.

Plan where to grow French Bean using our vegetable garden planner.

SunlightFull sun
WateringModerate
Height45cm
Spacing15cm
Germination7–14 days at 12°C+
Sowing MethodDirect or under cover
Frost HardinessTender
Sowing Depth5cm

When to Sow French Bean

Sow french bean in April, May, June, July.

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Sowing months

Time to Harvest French Bean

Expect to harvest approximately 2 months after sowing.

Companion Plants

Expected Yield

Dwarf varieties crop for 4–6 weeks; climbers for 8–10 weeks. Expect 3–4kg per 3m row.

Growing Tips

Self-pollinating; more reliable pod set than runner beans

Common Problems with French Bean

Poor germination in cold soil

French beans need soil temperatures of at least 12°C to germinate reliably. Sowing too early in cold, wet soil leads to rotting seeds. Warm the soil with cloches or black polythene for 2 weeks before sowing. Alternatively, start seeds in pots on a warm windowsill and transplant after the last frost.

Slugs eating seedlings

Emerging seedlings are extremely vulnerable to slug damage in the first 2–3 weeks. Start plants in pots and transplant when 10cm tall for better survival rates. If direct sowing, use organic slug pellets, copper barriers, or nematode biological control. Once plants are established, slug damage is minimal.

Bean seed fly

Larvae burrow into germinating seeds, hollowing them out so they fail to emerge. Most common in cool, wet springs and freshly manured soil. Sow in warmer conditions, start in pots to avoid the problem entirely, or cover direct sowings with fleece. Avoid incorporating fresh manure just before sowing.

Plan your french bean in the allotment planner

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