Plants & trees

Cashew

Anacardium occidentale

A cashew fruit with a red pear-shaped false fruit and the grey kidney-shaped nut hanging from its end

Photo: Abhishek Jacob · CC BY-SA 3.0 · via Wikimedia Commons

Where
Your garden, Dry forest, Coco town
When
Fruit in the dry season, roughly February to April
Size
A spreading tree to about 12 metres
Should I worry
Keep your distance
The fruit is safe and good. The raw nut shell contains an oil like poison ivy that burns skin. Never crack or roast raw cashews at home without knowing how.

The cashew tree is a small surprise. The nut, one per fruit, hangs off the bottom of a bright red or yellow pear-shaped thing that is itself edible, sweet, astringent and full of juice. That part is the marañón, and Costa Ricans have been drinking it for centuries.

Where you’ll see it

Gardens, hedges and dry forest edges across Guanacaste. It likes exactly this climate. Look for the odd two-part fruit in the dry season.

What to know

Eat the false fruit fresh, or as juice, or cooked into a jam. Leave the nut alone. The kidney-shaped shell contains an oil that burns skin on contact and gives off toxic smoke when heated, which is why roasting them at home over a fire is a bad idea that people try exactly once. Buy cashews shelled, from people whose job it is.

Questions people ask about this one

Why are cashews never sold in the shell?

Because the shell holds a caustic oil related to the irritant in poison ivy, which blisters skin and produces toxic smoke when burned. Cashews are shelled and roasted commercially in a process designed around that. The fruit the nut hangs from, the marañón, is completely safe and very good.

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