Black oak is a magnificent deciduous tree native to eastern North America, ranging from Florida to Texas and north to Maine, Ontario, Michigan, and Minnesota. This large member of the red oak group typically grows 50 to 60 feet tall with a broad, spreading crown, reaching mature dimensions of 50 to 60 feet in both height and width. Hardy from zones 3 through 9, it thrives in full sun and handles the challenging transition from moist, organically rich soils to poor, dry conditions with equal grace. The tree's distinctive appearance, especially its characteristic buds that differ noticeably from closely related red oak, makes it a striking addition to the landscape.
Full Sun
Moderate
3-9
720in H x 720in W
—
High
Hover over chart points for details
Black oak grows into a large, spreading tree with a globular crown that provides substantial summer shade. Its deep taproot system makes it challenging to transplant, but once established, it proves remarkably resilient in poor, dry soils where other oaks struggle. The tree tolerates proximity to black walnut, an unusual trait among many landscape plants. Its showy fruit and insignificant spring flowers add subtle seasonal interest without the mess of conspicuous blooms.
Black oak serves primarily as a shade tree and street tree, valued for its ability to create cooling canopies in parks, along roadsides, and in large residential landscapes. Its tolerance for black walnut and its capacity to thrive in poor, dry soils make it useful in situations where more temperamental shade trees would fail.
No timeline data available yet for this variety.
Transplant young trees in early spring or fall, though the species is notoriously difficult to transplant due to its deep taproot. Ensure the planting hole is deep enough to accommodate the taproot without bending or circling. Space trees 50 to 60 feet apart to allow for mature crown spread.
Prune black oak in late fall or winter when the tree is dormant to minimize disease entry and pest attraction. Remove any crossing branches, dead wood, or limbs that interfere with the main structural form. Avoid heavy pruning that would create large wounds, as the tree heals slowly. Because of its spreading, globular growth habit, minimal structural pruning is usually necessary beyond maintaining a sound branch framework.
Enter your ZIP code to see a personalized growing calendar for this plant.
“Black oak's story is one of continental distribution. This species naturally colonized upland hills, slopes, and ridges across a vast swath of eastern North America, evolving distinct characteristics that set it apart from its closest relative, red oak. The two species occasionally hybridize in nature, yet black oak maintains its identity through easily recognizable differences, particularly in bud structure. Its presence in the landscape predates European settlement and reflects millennia of adaptation to the varied soils and climates of the eastern forest.”