Black oak

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

What it needs

Conditions

Light

Full sun

Water

Low water

Spacing

40 ft

Habit

Large deciduous oak, 50 to 60 feet tall and about as wide, carrying a globular, spreading, rather open crown on a straight trunk. The branching is heavier and more irregular than the red oaks it grows alongside, and an open-grown tree keeps low limbs that a forest-grown one sheds.

Care tips

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Plant it small and never plan to move it. The deep taproot that makes black oak drought-proof is the same one that makes it hard to transplant, and a small tree left alone will overtake a large one that was dug and moved.

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Give it the dry site, not the good one. This is an upland ridge oak; it is at its most useful on thin, gravelly, acidic ground where a red or white oak would sulk.

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Do not prune in spring in oak-wilt country. Late-winter pruning only - the fungus moves through beetle-carried spores that are attracted to fresh spring wounds.

Lifecycle

Planting

Plant in spring in full sun, in average, acidic, dry to medium-moisture, well-drained soil. It prefers a rich moist loam but its practical value is the opposite end of that range - it establishes on poor, dry, gravelly upland ground where most large shade trees fail. Avoid wet or alkaline sites. Missouri Botanical Garden rates it hardy across zones 3 to 9, which is an exceptionally wide span for a large oak.

Transplanting

Difficult, and this is the single most important practical fact about the species. Black oak drives a deep taproot early, and Missouri Botanical Garden flags it as hard to transplant for exactly that reason. Plant a small container or bare-root tree and let it establish in place; do not plan to move an established one, and be sceptical of large balled-and-burlapped stock.

Early growth

Moderate, and slower above ground than it looks because the root system is being built first. Prune for a single leader in the first decade. Young bark is smooth and grey and gives no hint of the mature colour, so do not conclude you have the wrong tree.

Maturity

Long-lived and low-maintenance, with fewer disease problems than most oaks. Oak wilt is the serious threat: prune only in late winter and never in spring within an oak-wilt region. Acorn crops are heavy but irregular, on a 2-to-3-year cycle rather than annually.

Propagation

From acorns, which as a red-group oak require two growing seasons to ripen. Sow fresh in autumn with cold stratification; germination is good, and seedlings should go to their permanent site early while the taproot is still short.

Pollination

Wind-pollinated

Monoecious and wind-pollinated - drooping yellowish-green male catkins and inconspicuous female flowers appear on the same tree in April and May as the leaves emerge. A single tree sets acorns alone, though oaks cross freely and a stand produces heavier crops.

Plants don't grow alone

Larval host

Moth

Buck moth (Hemileuca maia)

Buck moth is an oak specialist strongly associated with dry, sandy and scrubby oak ground - exactly the upland habitat black oak occupies. Its communal spring caterpillars and autumn adult flight are one of the more visible insect events on an oak barren.

Larval host

Moth

Polyphemus moth (Antheraea polyphemus)

Polyphemus moth is a well-documented oak feeder. Oaks are the single most important native larval host genus for Lepidoptera in North America, so a black oak of any size supports a substantial share of the local caterpillar community - which is what feeds nesting songbirds.

Larval host

Moth

Imperial moth (Eacles imperialis)

Imperial moth larvae feed on oak foliage alongside the hairstreaks and duskywings that also use Quercus on dry upland sites.

Seed forage

Mammal

Eastern gray squirrel (Sciurus carolinensis)

Squirrels take and cache the acorns heavily. Black oak bears well only every 2 to 3 years, so a mast year is a local event that drives squirrel numbers into the following season.

Seed forage

Mammal

White-tailed deer (Odocoileus virginianus)

Deer browse fallen acorns through autumn and winter. Red-group acorns are more tannic and less preferred than white-oak mast, so they tend to be eaten later in the season once the sweeter acorns are gone - which makes them a useful late-winter resource.

Seed forage

Bird

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

Jays, woodpeckers and wild turkey take the acorns, and jay caching is a genuine dispersal mechanism that moves acorns well uphill of the parent tree. The canopy is also heavily used for nesting and insect foraging.

For people

Edible with preparation

The acorns are edible only after leaching. Black oak is a red-group oak, so they are high in tannin and bitter raw, and need repeated soaking or boiling in changed water before use as flour. Not a practical garden food source. The tannin-rich foliage and acorns are also a real risk to horses and livestock in quantity. The historically important product of this tree was never food but dye - quercitron, the yellow-orange inner bark.

Native range

Native across 36 US states.

Worldwide native range.

AHS heat range

1-11

Native ecoregions

Naturally belongs in 19 ecoregions - its native range crosses a state or province each one spans (not necessarily this exact habitat).

Appalachian mixed mesophytic forests

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 across eastern North America from Florida and Texas north to Maine, southern Ontario, Michigan and Minnesota, on upland hills, slopes and ridges. POWO returned HTTP 403 for this species, so the WGSRPD range was taken from the World Checklist of Vascular Plants rows served through GBIF - the same Kew dataset POWO publishes, verified in this batch against a species POWO did answer for.

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The Lady Bird Johnson Wildflower Center per-state occurrence list and the Kew native range agree completely for this species, which is unusual and worth stating: there is no naturalized layer to separate out here, so the map shows a single honest native range.

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Zone 3 to 9 is a genuinely enormous hardiness span, and it is the practical argument for the tree. Very few large shade oaks are usable from Minnesota to the Gulf, and black oak is comfortable across nearly the whole eastern half of the continent.

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Its real specialism is poor dry ground. Black oak holds ridge tops, gravel, sand and thin upland soils where richer-site oaks decline, and it will accept a site with periodic summer drought. It does not want wet feet or alkaline soil, and it is not the oak for a bottomland or a limestone garden.

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It tolerates black walnut, which is an uncommon and genuinely useful trait - the juglone that suppresses most trees under a walnut canopy does not trouble it.

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Plotwright assigns an editorial AHS heat range of 1-11, reasoned from the cited GBIF/WCVP range and Missouri Botanical Garden cultivation notes rather than from the USDA zones above. The continuous native span from Maine, southern Ontario, Michigan and Minnesota to Florida and Texas covers very cool through long-hot eastern summers, and its dry-ridge tolerance supplies no documented earlier heat failure. It remains a temperate eastern oak rather than a tropical species, so the range stops below 12. 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

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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.