Incorporate an all-purpose general fertiliser into the soil using a rake about two weeks before planting. After the last frosts, plant out in moist, fertile soil in a sunny location that's sheltered from strong winds or plant out at 20cm (8in) apart to help support each other.
Maintain moist soil at all times, watering consistently at the base during flowering, and heavily throughout harvest time if conditions are dry. Avoid overhead watering which can promote disease.
Feed with a low nitrogen, balanced fertiliser (such as fish, blood and bone in late February and again in mid-July), as beans don't require high nitrogen levels in the soil.
Harvest the beans when they're around 15cm (6in) long for best eating quality. Pick regularly to encourage more pod formation. French beans freeze exceptionally well compared to most other vegetables, making them excellent for storage.