Vegetable · Climbing legume
Yardlong Beans
Vigna unguiculata subsp. sesquipedalisA vigorous, heat-loving climbing bean grown for its slender, foot-long pods rather than dried seed. It needs consistently warm soil and a tall, sturdy trellis to really take off, rewarding a strong summer with weeks of steady picking. The one rule: wait for the soil to warm well past frost — cold, wet ground stalls germination completely.
Sow depth
1 in
Spacing
6 in · rows 3 ft
Sun
Full sun
Germination
6–10 days
Time to harvest
60–75 days
Difficulty
Easy
When to sow yardlong beans
- Sow from about 2 weeks after your last expected frost until about 11 weeks before the first expected autumn frost.
Wait for warm soil — seeds rot in cold, wet ground below 18°C.Direct sow at the base of a tall trellis; vines climb 10 ft or more.Sow a few seeds per station and thin to the strongest seedling.
Keep vines climbing — tie in early growth until tendrils take hold.Water about 1 in per week; pods form poorly if soil dries out.Feed lightly — too much nitrogen grows leaves at the expense of pods.
Pick pods young, while still slender and before seeds bulge inside.Harvest every day or two — pods toughen fast once left on the vine.Cut rather than pull pods to avoid damaging the productive vine tips.
Companion plants
As a nitrogen-fixer, yardlong beans feed heavy nitrogen users like sweetcorn planted alongside, though alliums nearby can stunt their growth.
Watch out for
Aphids — Cluster on new growth and flower buds in warm weather. Hose off with water or invite ladybirds into the bed.Powdery mildew — Coats leaves in humid, still conditions late in the season. Space vines well on the trellis for airflow.