Southern red oak

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

Central Pacific Northwest coastal forests

Cross-Timbers savanna-woodland

Eastern Australian temperate forests

Appalachian mixed mesophytic forests

What it needs

Conditions

Light

Full sun

Water

Low water

Spacing

40 ft

Habit

Large deciduous oak, 60 to 80 feet tall and 40 to 50 feet wide, carrying a notably straight trunk and an open, rounded, high crown. The crown is more open and airy than most large oaks, which is part of why it works as a street tree - it shades without feeling heavy.

Care tips

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Check the leaf underside, not the outline, when identifying it. The lobing varies wildly on a single tree; the dense rusty-woolly underside does not.

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Give it sand or poor clay and full sun. This is a dry upland oak - it is at its best on the ground that defeats bottomland trees, and it will not thank you for a rich irrigated bed.

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Do not plant it north of zone 6 and expect it to perform. The range limit is real; Missouri Botanical Garden puts its native Missouri occurrence only in the far southern counties.

Lifecycle

Planting

Plant in spring in full sun, in acidic, well-drained loam. It grows well in sandy soils and tolerates poor ground and drought, and Missouri Botanical Garden also records tolerance of soils with brief flooding - so the useful range runs from dry sand ridge to a site that puddles occasionally, but not to permanently wet ground. Give it 40 to 50 feet of room and keep it out of alkaline soil.

Transplanting

Move it young and in spring. Like most upland oaks it establishes a deep root system early, so smaller nursery stock transplants more reliably than large specimens.

Early growth

Reasonably fast for an oak on a suitable site. Prune for a single central leader in the first decade to build the straight trunk the species is capable of, then leave it alone.

Maturity

Low-maintenance and long-lived, with no serious insect or disease problems on Missouri Botanical Garden's assessment - though the genus-wide risks still apply, oak wilt above all. Prune in late winter and never in spring where oak wilt is present.

Propagation

From acorns, which as a red-group oak take two growing seasons to ripen. Sow fresh in autumn with cold stratification; the small acorns germinate readily.

Pollination

Wind-pollinated

Monoecious and wind-pollinated. Male catkins are a distinct red and female flowers green, both appearing in April and May with the new leaves. A single tree sets acorns on its own; a group sets heavier crops.

Plants don't grow alone

Larval host

Moth

Polyphemus moth (Antheraea polyphemus)

Polyphemus moth is a documented oak feeder. Oaks are the most important native larval host genus for Lepidoptera in North America, so a mature southern red oak supports a large share of the local caterpillar biomass that nesting songbirds depend on.

Larval host

Moth

Imperial moth (Eacles imperialis)

Imperial moth larvae feed on oak foliage. This is one of the giant silkmoths whose southern populations are strongly associated with the upland oak-pine woods southern red oak helps form.

Larval host

Moth

Regal moth (Citheronia regalis)

The regal moth - whose spectacular hickory horned devil caterpillar is the largest in North America - uses oaks among its hosts, and its range is centred on exactly the southeastern hardwood country this oak occupies.

Seed forage

Mammal

Eastern gray squirrel (Sciurus carolinensis)

Squirrels take and cache the small acorns heavily. The small size is an advantage here - they are easy to carry and cache, so dispersal away from the parent tree is efficient.

Seed forage

Mammal

White-tailed deer (Odocoileus virginianus)

Deer feed on the September-to-October acorn drop. Southern red oak is a substantial contributor to the upland mast crop across the Southeast.

Seed forage

Bird

Eastern songbirds (multi-species) (multiple species (Passeriformes))

The half-inch acorns are small enough for wild turkey, jays and woodpeckers to handle whole, where larger white-oak acorns are beyond many birds. The open high crown is also heavily used for nesting.

For people

Edible with preparation

The acorns are edible only after leaching. As a red-group oak they are high in tannin and bitter raw, and require repeated soaking or boiling in changed water before use as flour. They are small - under half an inch - which makes them poor value as a food source even prepared. Quantities of acorns and foliage are a real risk to horses and livestock.

Native range

Native across 23 US states.

Worldwide native range.

AHS heat range

4-11

Native ecoregions

Naturally belongs in 16 ecoregions - its native range crosses a state or province each one spans (not necessarily this exact habitat).

Appalachian-Blue Ridge forests

Atlantic coastal pine barrens

Central Tallgrass prairie

Chihuahuan desert

Cross-Timbers savanna-woodland

Eastern Great Lakes lowland forests

Edwards Plateau savanna

Flint Hills tallgrass prairie

Mississippi lowland forests

A dense, conical-to-narrow-pyramidal evergreen tree native to eastern and central North America, prized as a screening and foundation conifer. Flat, fan-like sprays of scale-like, aromatic yellow-green foliage clothe the tree from the ground up, and red-brown bark exfoliates on mature trunks. Wild trees can reach 40 to 60 feet but cultivated plants typically stay near 20 to 30 feet; small urn-shaped cones and dense evergreen cover make it valuable food and shelter for birds.

Climate notes

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Native to the southeastern and south-central United States, from eastern Texas and northern Florida north to southern Illinois, Ohio and New Jersey, on dry sandy and clay uplands of the coastal plain and piedmont. This is the one species in this batch for which POWO answered directly, so the WGSRPD range is Kew data taken at first hand.

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Missouri Botanical Garden notes that in Missouri it reaches only the far southern counties along the Arkansas border plus the bootheel - a useful reminder that the northern edge of the range is a real climate limit, not a soft one.

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The garden zone is 6 to 9, which is narrower and warmer than most eastern oaks. This is a southern tree; it is not a substitute for northern red oak in the Midwest or Northeast.

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Drought and urban tolerance are its practical arguments. Missouri Botanical Garden flags both explicitly, and together with a tolerance of poor sandy soils they make it one of the better large street and parking-lot oaks for the South.

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Do not plant it expecting autumn colour. The fall display is a dull reddish brown; "red oak" here refers to the group and the red male catkins, not to October.

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Plotwright assigns an editorial AHS heat range of 4-11, reasoned from the cited POWO range and Missouri Botanical Garden cultivation notes rather than from the USDA zones above. Northern Illinois, Ohio and New Jersey are a real cool-season edge, while eastern Texas, northern Florida, drought tolerance and urban tolerance establish a durable long-hot-summer ceiling. The higher floor distinguishes it from the broad continental oaks beside it, and the range does not claim tropical heat. This is a conservative Plotwright interpretation, not a copied AHS rating.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Thuja occidentalis

American arborvitae

A medium-to-large native shade tree of central and eastern North America, reaching 50 to 80 feet with an ovate-rounded crown and large, asymmetric heart-shaped leaves. In June it carries pale-yellow, intensely fragrant flowers on pendulous cymes - each cluster hung from a distinctive strap-like leafy bract - that ripen into pea-sized nutlets. The fragrant June bloom is a premier nectar source: Missouri Botanical Garden lists it as attracting bees and butterflies, and the Lady Bird Johnson Wildflower Center flags it as having special value to both native and honey bees.

The only native U.S. holly with both spiny green leaves and bright red berries - an upright, pyramidal, broadleaf evergreen tree that slowly matures to 15 to 30 feet in cultivation (to 50 feet in the wild). Thick, leathery, deep green leaves bear spiny marginal teeth, and pollinated female trees carry showy red-to-orange drupes that ripen in fall and persist through winter as bird food. This is the classic "Christmas holly" of wreaths and decorations.

A small-to-medium understory tree of dry, rocky eastern-North-American woods, named for its drooping clusters of papery, sac-like seed pods that resemble the fruit of hops. The birch-like, sharply-serrated leaves turn an undistinguished yellow in fall, and reddish-brown male catkins persist on the bare branches through winter. Also called ironwood for its extremely hard, dense wood; tough, low-maintenance, and drought-tolerant once established.

A tough, medium-sized native tree of the eastern and midwestern United States, grown as much for its showy edible orange fruit as for its distinctive thick, dark gray bark broken into rectangular blocks. Small urn-shaped white-to-greenish-yellow flowers open in May and June, and the sweet fruit ripens after frost. Largely dioecious - a female tree needs a male pollinizer nearby to set fruit - and notably drought- and walnut-tolerant once established.

Full sun / Part shade

A small native deciduous tree (or thicket-forming, suckering shrub) of eastern and central North America, grown for clouds of fragrant white 5-petaled flowers that open in March before the leaves and for the edible red plums that follow in early summer. It forms a broad, spreading crown with attractive dark reddish-brown twigs that sometimes carry thorny lateral branchlets. A documented larval host for swallowtails and other butterflies, with flowers of special value to native, bumble, and honey bees.