The same bees that pollinate the flowers of the Brazil nut trees pollinate orchids, which are epiphytes (in other words, plants that grow on other plants); however, orchids cannot grow on Brazil nut trees. These observations explain

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The observations explain why Brazil nut trees do not set fruit in plantations because the specific bees that pollinate them, and also pollinate orchids, may not be present in plantation settings where the natural ecosystem, including orchids and other plants the bees interact with, is altered or absent. This disrupts the pollination process necessary for Brazil nut trees to set fruit.

The Same Bees That Pollinate the Flowers of the Brazil