It’s Plum Season! But Beware, This is Not a Plum

Inquiring Marylanders want to know: Are these fruits that fell from an oak tree?

We received a couple questions this season from curious residents of Montgomery County who found “fruits” that look like small plums. These objects had dropped from oak trees.

While these fruit-like items do look similar to plums, they are not edible at all! These are acorn plum galls, which are caused by a type of wasp in the family Cynipidae.

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