In general, the deciduous species are more common from the Midlands north, while the evergreens favor conditions in the Coastal Plains. The height and spread varies depending on the species. The deciduous species are large and often attractive with their massive trunks and limbs, even in winter without their leaves. Leaves are variable, depending on the species.
Evergreen species have dark, glossy leaves.
Acorns are important food for wildlife. Flowers are not showy. Oaks are divided into two groups. This group includes water oak, willow oak, black oak, Japanese evergreen oak, Southern red oak and pin oak. They bear acorns that mature that same fall.