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White Oak
Quercus alba
Non-nativeDeciduousAngiospermLarge (30m or more)
Introduction

This is a New World ‘white oak’ but quite different to European native oaks, which confusingly are often known by the same term in the wood trade. Introduced 1724.

Distribution

Native to eastern North America; in Europe generally restricted to collections and gardens.

Biology

Monoecious. Wind-pollinated. Animal-dispersed.

Identification

Tall (30m) and broad-domed. Bark dark grey, with narrow flattened ridges that peel outwards at the base, looking shaggy. Foliage turns red-purple in autumn while still on the tree. Leaves resemble Pedunculate Oak's but taper very narrowly to a long petiole (10-25mm). Fruit a sessile acorn (no peduncle) in a warty-scaled cupule.

Culture

Requires summer warmth to thrive.

Biodiversity

A keystone species for biodiversity in its native range, and prominent in the treescape.

Threats

Generally healthy.

Uses

Ornamental. Might thrive more in north-west Europe under a changing climate.

Related news
Key
Native statusNon-native
Foliage typeDeciduous
Tree groupAngiosperm
Size classLarge (30m or more)
Conservation status (IUCN)No category recorded
Classification
DivisionAngiospermae
OrderFagales
FamilyFagaceae
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