Southern live oak

Sun

Full sun; young trees tolerate partial shade, but develop a better crown in open light.

Water

Water regularly while establishing; established trees tolerate drought. Avoid frequent, shallow lawn irrigation around the trunk.

Soil

Adaptable to sandy, loamy or clay soils, including mildly alkaline soils; prefers good drainage. Tolerates coastal salt spray and occasional brief flooding, but not persistently waterlogged ground.

Height

40-80 ft (12-24 m)

Spread

60-100 ft (18-30 m)

Flowers

Spring: inconspicuous yellow-green male catkins and tiny female flowers.

Foliage

Evergreen. Leathery, oval, dark green leaves with pale, finely hairy undersides; margins are usually smooth. Old leaves fall around the time new growth appears in spring.

Growth

Moderate, sometimes fast when young with adequate moisture; slower on dry or poor sites.

Care needed

Medium

• Plant where the mature crown and spreading roots will have room, well away from buildings, paving and overhead wires.
• Water deeply through the first two or three growing seasons, allowing the surface soil to dry between waterings.
• Maintain a 2-3 in (5-8 cm) layer of organic mulch over a broad root area, keeping it clear of the trunk.
• Do not routinely fertilize established trees; test the soil before correcting suspected nutrient deficiencies.
• Protect the root area from excavation, added soil, vehicle traffic and dense new planting.

Pruning. Train young trees gradually to develop well-spaced main branches; use a qualified arborist for large limbs and never top the crown. Where oak wilt occurs, follow local pruning restrictions, avoid the high-risk spring period, and promptly paint all fresh wounds as locally recommended.

Autumn

Plant in mild climates while the soil is warm, leaving the root flare visible at the surface.

Winter

Inspect branch structure and arrange necessary pruning during the locally recommended oak-wilt-safe period.

Spring

Expect old-leaf shedding as new leaves emerge; keep fallen leaves as mulch where practical.

Late spring

Check new growth for abnormal wilting or rapid browning and seek a diagnosis promptly if symptoms spread.

Summer

Deep-water young trees during dry spells and check that mulch remains clear of the trunk.

Autumn

Collect freshly fallen, sound acorns for immediate sowing; remove acorns from areas used by grazing horses.

• Use as a single specimen in a large lawn or park-like garden, allowing its low limbs to develop naturally.
• Plant along a broad drive or avenue where crowns can eventually meet without conflicting with buildings or utilities.
• Create a shaded sitting area beneath an established crown, using permeable surfaces rather than excavating for paving.
• Anchor a coastal or southeastern native garden with shade-tolerant shrubs and ferns beneath the outer canopy.

Garden styles it suits: Southern, Grand estate, Traditional, Coastal, Woodland and Wildlife garden.

Plant it with: Yaupon holly, American beautyberry, Dwarf palmetto, Southern wood fern and Inland sea oats.

Wildlife: Acorns feed squirrels, deer, wild turkeys and other birds. The canopy provides nesting and shelter, and the foliage supports many moth and butterfly caterpillars.

• Oak wilt: a potentially fatal disease, especially important in Texas. Avoid pruning during local high-risk periods, paint fresh wounds as advised, and obtain urgent professional diagnosis for rapid canopy browning.
• Root rot and decline: persistent wetness, buried root flares and soil compaction damage roots. Improve site drainage without cutting major roots, keep soil off the trunk and stop traffic beneath the crown.
• Scale insects: heavy infestations can cause sticky honeydew, sooty mould and weakened growth. Identify the scale before treatment; conserve beneficial insects and use a labelled treatment only when needed.
• Weak branch unions or storm damage: crowded or poorly attached limbs can split as the crown enlarges. Begin structural pruning while young and have mature trees inspected by a qualified arborist.

Leaves, buds and acorns contain tannins and can be poisonous if eaten in quantity. Horses are particularly at risk of serious digestive and kidney damage; dogs and cats can also become ill after ingestion, and acorns may cause choking or intestinal blockage. Raw acorns and foliage are not safe food for people, especially children.

• Sand live oak (Quercus geminata)

  Usually has strongly rolled-under leaf margins and conspicuously cupped leaves with densely hairy undersides; often forms a smaller, irregular tree on dry sandy sites.

• Escarpment live oak (Quercus fusiformis)

  Usually smaller and more drought- and cold-tolerant, with distinctly elongated, spindle-shaped acorns. Leaves overlap in appearance, and hybrids can be difficult to identify.

• Laurel oak (Quercus laurifolia)

  Usually has narrower, thinner leaves with less hairy undersides and a more upright crown, rather than the massive, widely spreading limbs typical of mature Southern live oak.

Quercus is the Latin name for oak, virginiana refers to Virginia, and 'live oak' describes its retention of green leaves through winter.

Propagation. Sow fresh, sound acorns soon after they fall; they lose viability if allowed to dry out. Protect seed pots from rodents and plant seedlings out while young, before their roots become crowded.

Accepted botanical name

Quercus virginiana

In the US and Canada

Native in the lower 48 states.

Native range

Alabama, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Texas and Virginia.

Measured

Soil pH 4.5 to 7.3. Average height 1135 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.