A fast growing, evergreen, native of the Andes, which grows to around 30 m. Trees have been known to reach 10 m in 10 years in New Zealand. Because they come from high altitude (2,500 m) tropics, their climate is essentially temperate They tolerate temperatures between - 3°C and 40°C.
The trees grow well along stream banks, but also appear to be able to tolerate the hot dry summers of south west Western Australia without supplementary watering. They have a low chilling requirement.
This black shelled walnut is large with a very thick shell. This makes it ideal in parrot country, but reduces the amount of flesh in the nut and renders it harder to crack open. The nuts are eaten raw or used in pastries, sweetmeats and other confectionery.
The timber is hard, attractive and highly prized for cabinet making, carving and general woodwork. The quest for the valuable timber is threatening old stands in the Andes. Despite their value, they are even being cut for firewood in parts of the Andes where firewood is difficult to secure.
Propagation is by seed. Trials so far, suggest that direct planting of sprouted seed seems a viable method of establishing large plantings.