Overcup Oak is a medium to large oak of bottomland and swamp forests in the southeastern United States, named for its distinctive acorn that is almost entirely enclosed by a deep, bumpy, fringed cup — a feature unique among eastern oaks. It grows in frequently flooded lowlands and river swamps where few other oaks can survive, tolerating prolonged inundation. Its acorns float and remain viable for months, allowing water dispersal. The acorns are consumed by wood ducks and deer when accessible.
Best time to see a Overcup Oak
The best time to see a Overcup Oak is July–November, when about 60% of U.S. sightings happen, based on 1,357 research-grade iNaturalist observations.
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Recent Overcup Oak sightings near you
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