White oak

Sun

Full sun; tolerates light shade when young.

Water

Water regularly while establishing. Established trees tolerate moderate drought but not prolonged waterlogging.

Soil

Deep, well-drained, acidic to neutral soil; grows in loam, sandy soil or well-drained clay. Strongly alkaline soil can cause yellow leaves.

Height

50-80 ft (15-24 m), occasionally taller

Spread

50-80 ft (15-24 m)

Flowers

Spring, as leaves emerge; yellow-green male catkins and tiny reddish female flowers.

Foliage

Rounded, deeply lobed leaves emerge pinkish or silvery, mature green above and pale beneath, then turn red, burgundy or brown in autumn. Young trees may retain brown leaves through winter.

Growth

Slow to moderate, often 12-24 in (30-60 cm) a year when young and well established.

Care needed

Low

• Plant a young, nursery-grown tree in its permanent position; established white oaks are difficult to transplant.
• Water deeply during dry spells for the first two or three growing seasons, allowing the soil to drain between waterings.
• Maintain a 2-3 in (5-8 cm) layer of organic mulch over a broad root area, keeping it away from the trunk.
• Keep vehicles, paving, added soil and trenching out of the root zone.
• Do not feed routinely; investigate poor growth or yellow leaves before applying fertilizer.
• Stake only if the root ball moves in wind, and remove supports after establishment.

Pruning. Train young trees during winter dormancy, retaining one main leader and well-spaced branches; avoid topping or unnecessary pruning of mature trees. Where oak wilt occurs, follow local pruning restrictions and avoid pruning during the growing-season transmission period; use a qualified arborist for large limbs.

Winter

Inspect the branch structure and arrange any necessary dormant-season pruning.

Early spring

Plant nursery-grown trees once the ground is workable, keeping the root flare at soil level.

Spring

Refresh mulch without piling it against the trunk, and check new leaves for persistent yellowing.

Summer

Deep-water young trees during dry spells and keep mowing equipment away from the bark.

Autumn

Collect sound, freshly fallen acorns for immediate sowing; they should not be allowed to dry out.

Late autumn

Leave some fallen leaves beneath the canopy as habitat and mulch, keeping paths and drains clear.

• Use as a specimen shade tree in a large lawn, allowing room for its eventual broad crown.
• Anchor an eastern North American native woodland with smaller understory trees and shade-tolerant groundcover.
• Plant on a spacious property boundary or park edge for long-term structure and autumn colour.
• Use beside a meadow or naturalized area, where fallen leaves and acorns can remain without creating a nuisance.

Garden styles it suits: Grand estate, Woodland, Wildlife garden, Traditional, New England and Autumn colour.

Plant it with: Flowering dogwood, Eastern redbud, American witch hazel, Pennsylvania sedge, Christmas fern and Wild geranium.

Wildlife: In its native range, supports many moth and butterfly caterpillars that feed birds. Acorns feed squirrels, deer, wild turkeys and other wildlife; older trees provide nesting sites and cavities.

• Oak wilt can kill white oaks, although decline is often slower than in red oaks. Seek a prompt professional diagnosis for unexplained wilting or branch death, avoid high-risk pruning periods and never move infected firewood.
• Leaf anthracnose causes blotches, curled leaves and occasional spring leaf drop in cool, wet weather. Most established trees recover without treatment; water during drought and have repeated severe damage assessed.
• Iron chlorosis on alkaline soil produces yellow leaves with greener veins. Test the soil and seek targeted treatment; choosing a less alkaline planting site is more reliable than repeated feeding.
• Root damage, compacted soil or poor drainage can cause crown dieback. Protect the root zone, avoid changing soil levels and have declining mature trees assessed by an arborist.

Acorns, buds and leaves, especially young leaves, contain tannins and can poison horses and other grazing livestock, causing serious digestive and kidney damage. Dogs can develop vomiting, abdominal pain and potentially kidney injury after eating significant amounts of acorns or leaves; acorns also present a choking or blockage risk. Keep cats from eating them too, although documented poisoning is less common. Raw acorns and leaves are not suitable for people to eat;

• Swamp white oak (Quercus bicolor)

  Leaves have shallower lobes or coarse rounded teeth and distinctly whitish, hairy undersides; acorns usually hang on long stalks.

• Bur oak (Quercus macrocarpa)

  Leaves often have a strongly narrowed middle and a broad upper section; the large acorns have conspicuously fringed cups.

• English oak (Quercus robur)

  Leaves have very short stalks and small ear-like lobes at the base; acorns are carried on long stalks, unlike the short-stalked acorns of white oak.

Quercus is the Latin name for oak, and alba means white, referring to the tree's pale bark.

Propagation. Sow fresh, sound acorns promptly in autumn in deep containers or a protected nursery bed. White oak acorns often start rooting soon after falling, do not tolerate drying, and need protection from rodents; move seedlings while young to minimize root disturbance.

Accepted botanical name

Quercus alba

In the US and Canada

Native in Canada and the lower 48 states.

Native range

Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky and Louisiana.

Measured

Soil pH 4.5 to 6.8. Average height 1990 cm.

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