American Groundnut

Apios americana is a fascinating tuberous climbing legume native to North America but increasingly popular in UK forest gardens and permaculture designs. It produces twining stems that can reach 3-4 metres, featuring pinnate leaves and unusual clusters of pea-like, chocolate-maroon and pink flowers that emit a pleasant, violet-like fragrance. The plant produces strings of edible tubers along its roots, which have a nutty flavour and a high protein content, historically used as a food source by indigenous peoples. In the UK, it is fully hardy (H5) but requires a long, warm summer to produce a significant crop of tubers. It prefers a moist, fertile soil and can tolerate partial shade, though flowering is better in sun. It is a nitrogen-fixer, helping to improve soil health. While it can be slightly invasive in ideal conditions, its unique flowers and edible potential make it a worthy addition.

Sun: Full sun to partial shade.

Soil: Moist, fertile, humus-rich soil.

Hardiness: H5 — down to −15°C.

Flowering: Jul, Aug, Sep.