A towering emergent of the Amazon rainforest whose softball-sized fruits hold the familiar wedge-shaped nuts, harvested almost entirely from wild trees.
Where it grows
Brazil nut grows wild in the Amazon basin across Brazil, Bolivia, Peru, Venezuela, Colombia, and the Guianas, often emerging high above the surrounding canopy on terra firme soils. Despite the name, the largest annual harvests now come from Bolivia. Plantations exist but yield poorly — the trees thrive only in intact forest.
How to recognise it
Mature trees are unmistakable emergents, their massive grey trunks rising bare to a flat crown of leaves high above the canopy. The hard, cannonball-sized fruits contain 10 to 25 nuts arranged like orange segments. Falling fruits — up to 2 kilograms apiece — can be lethal, and Brazil nut harvest is reputedly the most dangerous nut-gathering on Earth.
Uses
The kernels are oil-rich, high in selenium, and traded globally as snack nuts. Cold-pressed Brazil nut oil is also used in cosmetics, soaps, and traditional remedies. Harvested entirely from wild forest, the trade supports forest-dwelling communities and is a model for sustainable non-timber extraction.
Ecology
Brazil nut flowers can only be pollinated by certain large-bodied orchid bees, and the seeds can only be released from the woody fruit by the agouti — a rodent. Without the bees and agouties, the species cannot reproduce.