The fast-growing American walnut, valued as much for its nuts as for its high-value timber. Very hardy, it fits perfectly in large orchards at altitude.
Native to North America, the black walnut grows faster than the common walnut and becomes a majestic tree. Its very hard-shelled nuts stay sound for a long time, even after falling to the ground. The kernel is edible, with a stronger, slightly bitter flavour.
Full sun, deep, rich soil. Reserve it for large spaces. Its roots hinder certain crops: avoid planting tomatoes and potatoes beneath it.
A farm-grown plant raised outdoors at 1,000 m altitude in the Livradois-Forez Regional Nature Park: never in a heated greenhouse, fed with organic fertiliser only and grown following permaculture principles.