Legumes
Climbing bean
Phaseolus vulgaris var. vulgaris
Timings for your region
Suggested: Moderate · Explained in the glossary
Sow outdoorsmid May – mid June
Harvestmid July – early October
Practical tip
Put the poles up before you sow — pushing them in later tears the roots. Eight beans in a ring around each pole.
Origin & history
Climbing beans are the original growth form of the American common bean — the low bush types are later selections from them. In Mesoamerica they grew in the milpa alongside maize and squash, with the maize providing the pole. The red-flowered runner bean arrived in European gardens in the 17th century, at first as an ornamental. Incidentally, all beans twine in the same direction; wind a shoot the other way round the pole and it will unwind itself again.
Varieties
Two different species are sold as “climbing bean”: the classic common bean with white or violet flowers, and the sturdier runner bean with red flowers and thick seeds, which copes far better with cool, half-shaded spots. Look for “stringless” on the packet, otherwise every pod needs stringing, and check the final height — some varieties reach 2.5 m, others stay under two. If you want dried beans for winter, you need a variety explicitly grown for the seed.
Care
Guide the first shoots onto the pole by hand, after that they climb by themselves; when the tip reaches the top of the pole, cut it back so the plant keeps setting lower down. Water evenly from flowering on — drought or heat above 30 °C makes the flowers drop without setting a pod. No feeding; a mulch layer keeps the soil evenly moist and the shallow roots cool.
What can go wrong
The biggest risk is mechanical: a fully laden bean wigwam catches a summer storm like a sail, so drive the poles in deep enough and tie them firmly together at the top. On the self-pollinating common bean, flowers dropping without setting pods is almost always a water or heat question, not a pollination problem. Against a hot, sheltered house wall spider mites take hold — a more airy position and even soil moisture are the only reliable prevention.
Harvest, storage & kitchen
Climbing beans keep cropping for weeks as long as nothing ripens on the plant — so go through every two or three days without fail, even when nobody feels like eating beans. A pod is right when it snaps cleanly and the seeds are not yet bulging through. At the end of the season let the last pods dry to parchment: the seeds are then dried beans for the store cupboard and seed for next year — and beans are always cooked, never raw.
All timings are guide values for the given climate, not a guarantee. Weather, aspect and variety all have a say.