Swamp white oak is a long-lived native tree valued for its adaptability, wildlife benefits and attractive year-round appearance. Despite its name, it grows well in both moist and well-drained soils, making it an excellent choice for a wide range of landscapes. Its broad canopy provides generous shade, while its distinctive leaves and textured bark add seasonal interest throughout the year.
Quick Facts
Height: approximately 40 feet in urban settings
Spread: approximately 40 feet in urban settings
Form: rounded crown with upright branches
Leaves: simple, shiny, dark green above and hairy, whitish-green beneath, obovate (fiddle-shaped) with rounded lobes and smooth edges; emerge in spring; yellow to orange to red and sometimes purple in fall
Flowers: long, yellow-green, male catkins and small, green to red, female catkins; emerge in mid-spring with the leaves
Fruit: small, green to tan, oval acorns with bowl-shaped caps borne singly or doubly on long stalks; mature in late summer/early fall
Bark: smooth, brown when young; deeply furrowed, dark grey-brown when mature
Distinguishing Feature
The striking contrast between its glossy green upper leaf surface and silvery white underside gives the canopy a shimmering appearance when stirred by the wind. This two-toned foliage makes swamp white oak easy to recognize throughout the growing season.
Why We Love It
Swamp white oak is a highly adaptable native tree that thrives in a wide range of growing conditions. Once established, it tolerates seasonal flooding, compacted soils, urban conditions and periods of drought. Its large canopy provides valuable shade that helps cool neighbourhoods, while its acorns support birds, squirrels and other wildlife. Its resilience and beauty make it an excellent choice for parks, streetscapes and residential properties.
