Blackjack Oak (Quercus marilandica) is a compact native deciduous oak of the red oak group that thrives in the harshest conditions where other trees struggle. Growing 20 to 40 feet tall and wide across hardiness zones 6 through 9, this small to medium-sized tree earns its tough reputation by flourishing in poor, dry soils that would defeat lesser plants. Its distinctive leathery, obovate leaves stay dark green through the season, and its scruffy, irregular form gives it character rather than demanding formal perfection. Native from New Jersey to Missouri and south to Florida and Texas, blackjack oak appears naturally in open, barren areas, flatwoods, glades, and dry ridges, making it an excellent choice for gardeners seeking a low-maintenance native that handles drought with ease.
Full Sun
Moderate
6-9
480in H x 480in W
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High
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Blackjack oak thrives where few other trees will grow, asking only for full sun and dry, acidic soil to reach its modest but sturdy height of 20 to 40 feet. Its leathery, blackjack-like foliage turns rich colors in fall, while its showy acorns provide food for wildlife throughout autumn and winter. The tree handles drought exceptionally well and requires minimal maintenance once established, making it a genuinely low-effort native that transforms poor sites into thriving habitat.
Blackjack oak serves primarily as a wildlife tree, producing abundant acorns that feed deer, wild turkeys, squirrels, and other native fauna through fall and winter. Its dense canopy and sturdy growth habit make it valuable for erosion control and habitat restoration in degraded sites, particularly in eastern and midwestern landscapes where native oak regeneration is a conservation priority.
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“Blackjack oak is native across a broad swath of eastern North America, from New Jersey west to Missouri and south through the Carolinas, Georgia, and Florida to Texas. Its common name references the distinctive shape and texture of its leathery leaves, which resemble the playing card suit. For centuries, this species has naturally colonized abandoned fields, sandy ridges, and woodland edges throughout its range, serving as a pioneer tree that stabilizes poor soils and establishes habitat where other oaks struggle to survive.”