The Live Oak (Quercus virginiana) is an iconic evergreen oak of the American South, instantly recognizable by its massive, spreading, often horizontal branches draped in silvery-gray Spanish moss. One of the most picturesque trees in North America, its broad, dome-shaped canopy can spread over 45 meters — wider than almost any other tree on the continent. The tree gets its name from its evergreen habit, remaining "live" and green throughout the winter while other oaks stand bare.
• Named for its evergreen habit — it stays green and "live" year-round
• One of the widest-spreading trees in North America, with crowns exceeding 45 meters across
• The state tree of Georgia
• Iconically draped in Spanish moss (Tillandsia usneoides) throughout its range
• The wood is among the densest and hardest of any North American oak — so dense it sinks in water
• Famously used in the construction of the USS Constitution ("Old Ironsides"), whose live oak hull repelled British cannonballs in the War of 1812
• Ranges from southeastern Virginia southward through the Carolinas, Georgia, Florida, Alabama, Mississippi, Louisiana, and into southeastern Texas
• Most abundant along the Atlantic and Gulf coastal plains
• Also occurs on the Florida Keys and various barrier islands
• Found at elevations from near sea level to approximately 150 meters
• First described by the Swedish botanist Carl Linnaeus's son in 1788
• A defining tree of the cultural landscape of the American South, from the oak-lined avenues of Savannah and Charleston to the live oak groves of the Gulf Coast
• The species has been planted ornamentally well beyond its native range, including in California
• Closely related to the Texas live oak (Quercus fusiformis) of central and western Texas
• Ancient live oaks are among the most treasured and protected trees in southern cities
Size:
• Typically 12 to 18 meters tall, but crown spread can reach 30 to 45 meters or more
• Trunk diameter: 0.6 to 2 meters, with ancient specimens exceeding 3 meters
• Crown is broadly dome-shaped, with massive, spreading, often nearly horizontal branches
• Branches often extend far beyond the drip line, creating enormous shaded areas
Bark:
• Dark brown to blackish, thick, blocky, and deeply furrowed
• Often colonized by resurrection fern (Pleopeltis polypodioides) that turns green after rain
Leaves:
• Thick, leathery, elliptical to oblanceolate, 2 to 10 cm long and 1 to 4 cm wide
• Dark glossy green above, pale grayish-green and smooth beneath
• Margins are usually entire (smooth) or with a few shallow, irregular teeth near the apex
• Often revolute (rolled under) at the margins
• Persist for about one year, dropping in spring as new leaves emerge
Acorns:
• Small, ovoid, 1.5 to 2.5 cm long
• Dark brown to blackish, borne on long stalks (3 to 8 cm)
• Cup is shallow, covering about one-third of the acorn, with tightly appressed scales
• Mature in a single growing season (annual, white oak group)
• Sweet and relished by wildlife
Habitat:
• Found in coastal plains, maritime forests, barrier islands, and sandy ridges
• Tolerates salt spray, sandy soils, and occasional flooding
• Often the dominant tree in maritime evergreen forests along the Atlantic and Gulf coasts
• Grows in areas receiving 1,000 to 1,600 mm of annual rainfall
• Tolerant of shade in youth, eventually becoming a canopy dominant
• Deep, extensive root system provides exceptional wind resistance
Ecosystem role:
• The massive, spreading canopy provides critical nesting habitat for a wide variety of birds, including great horned owls, osprey, and various herons
• Acorns are a major food source for wild turkeys, deer, squirrels, raccoons, and numerous bird species
• Spanish moss (Tillandsia usneoides) drapes from branches, providing nesting material for birds including the parula warbler and Baltimore oriole
• Resurrection fern grows on branches, turning green after rain
• The dense evergreen canopy provides year-round cover for wildlife
• Live oak hammocks are among the most biologically diverse habitats in the southeastern United States
• Exceptionally resistant to hurricane-force winds due to deep taproot and wide root system
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The USS Constitution, the oldest commissioned warship still afloat in the world, earned the nickname "Old Ironsides" during the War of 1812 because British cannonballs appeared to bounce off her hull — which was built from the incredibly dense wood of southern live oak. The wood is so dense (specific gravity of 0.80 to 0.95) that it actually sinks in water, and the tree's massive, curved lower branches were specifically sought for ship knees and hull ribs.
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