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. White oak is included in this group.
Oaks are valuable as shade trees, specimens and street trees.
Most oaks need considerable space, and they are generally not well-suited for small home grounds. Evergreens work well in screens and, because they are often smaller, work well on smaller properties. Old oaks are worth preserving. Oaks are subject to many pests, depending on the species. Problems include galls, scale insects, borers, leaf spots, bacterial leaf scorch and oak wilt.