Cashew plants belong to a group of plants known as anacardiaceae, which includes mango, sumac and poison ivy. Cashew trees grow in warmer climates, such as India and Vietnam, who are some of the ...

The trees are a member of the same family as poison ivy, and like poison ivy, cashew plants contain a toxin called urushiol. It's found in the plant itself and the brown oil inside a nut's shell.