The fastigiate English oak is a columnar form of the species. This cultivar and related hybrid columnar forms are proving more useful in the U.S. than the species itself. These cultivars should be sited in full sun to reduce the potential for mildew in our humid summers.

The genus Quercus includes more than 600 species of the oak tree, of which 90 are native to North America; the Chicago Botanic Garden's collection contains more than 60 varieties and over 1,000 individual trees. Twenty oak species are native to Illinois.

Oaks are slow growing, long lived, hard wood trees that produce fruit we all know as acorns. Within the white oak group, acorns mature annually; in the red oak group, acorns take two years to mature (biennial). Oaks are often imposing shade trees at maturity and provide habitat and food for a variety of wildlife.