Overcup oak is a medium-sized deciduous tree native to the southeastern U.S., named for its remarkably distinctive acorn cup that wraps protectively around the nut, often covering two-thirds or nearly the entire acorn. Growing 40 to 60 feet tall with a straight trunk and broad rounded crown, this bottomland species thrives in hardiness zones 5 through 9 and brings both architectural grace and ecological resilience to landscapes. A member of the white oak group, overcup oak naturally inhabits floodplain forests, coastal plain swamps, and areas prone to seasonal inundation, making it exceptionally valuable for wet sites where many trees struggle.
Full Sun
Moderate
5-9
720in H x 720in W
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Moderate
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The acorn cup alone makes this tree instantly recognizable, its bur-like structure nearly engulfing the nut in a way that feels almost sculptural. Overcup oak handles the toughest growing conditions with quiet confidence, tolerating wet poorly drained soils, occasional flooding, and clay that would defeat lesser trees. Its strong straight trunk and broad rounded form create substantial shade for southeastern landscapes, while its native range and ecological ties to bottomland forests make it a choice with real conservation merit.
Overcup oak serves primarily as a shade tree in residential and ecological restoration landscapes. Its particular value lies in sites where wet conditions, poor drainage, and clay soils limit other tree options, such as rain gardens, bioswales, floodplain restoration projects, and low-lying areas prone to seasonal standing water. In its native southeastern range, it functions as a keystone species in bottomland forest communities, providing structure, wildlife habitat, and hydrological resilience.
No timeline data available yet for this variety.
Bare-root or balled-and-burlapped nursery trees establish best when planted in early spring or fall, giving roots time to anchor before summer heat or winter dormancy. Space plants 40 to 60 feet apart to allow full crown development. Mulch the planting area to conserve moisture and moderate soil temperature, though avoid piling mulch against the trunk.
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“Overcup oak occurs naturally throughout floodplain forests, lowlands, and along swamps and bayous in the southeastern United States, where it has been a foundational species of coastal plain swamp ecosystems for centuries. As part of the white oak group, it represents a lineage of oaks that evolved specifically to survive the challenging hydrology of bottomland environments. Its presence in these ecosystems predates European settlement and continues to anchor native plant communities from the Atlantic coastal plains westward.”