Pistachio basics
Is a Pistachio a Nut or a Seed? The Botanical Answer
Botanically a seed, culinarily a nut. The clear answer to whether a pistachio is a nut or a seed — and why it matters.
Quick answer
Botanically, a pistachio is a seed — specifically the seed of a fruit called a drupe, like almonds, cherries and peaches — not a true nut. Culinarily and for food labelling and allergies, however, it's classed and treated as a tree nut, so anyone with a tree nut allergy should avoid pistachios.
This is the companion to our what is a pistachio overview, answering the specific question people ask: is it a nut or a seed?
The botanical answer
Botanically, a pistachio is a seed — specifically the seed of a fruit called a drupe, the same family as almonds, cherries, peaches and olives. The "shell" is part of the fruit's stone. So the strict botanical answer is "seed of a drupe", not a true nut (true botanical nuts include hazelnuts and chestnuts).
The culinary and allergy answer
In the kitchen — and crucially for food labelling and allergies — pistachios are treated as tree nuts. That's the answer that matters for safety: anyone with a tree nut allergy should avoid pistachios and pistachio products, including pistachio milk.
Why the distinction matters
- Cooking: pistachios behave like nuts, so recipes treat them that way.
- Allergies: they're labelled and regulated as tree nuts — always heed that.
- Trivia: it's why almonds and pistachios are botanically similar (both drupe seeds).
For more pistachio basics, see what is a pistachio and why pistachios are green.