Hybrid Elm Trees

Identification

• Some elm tree hybrids are Delaware, Princeton, Discovery and Prospector. Prospector was introduced by the National Arboretum.

Description

• The Delaware elm tree has a mature height of 70 to 80 feet, with a spreading form and vigorous growth habit. The Princeton has a rapid growth rate, achieving 60 to 70 feet with a uniform vase like shape. It is resistant to elm leaf beetles. The Discovery is also resistant to elm leaf beetles and grows to about 40 feet tall with a 35-foot spread. The tree has superior cold hardiness. The Prospector is a hardy hybrid that also grows 40 feet tall with a vase shape. The tree is stronglyl resistant to elm leaf beetles and elm yellows.

Cultural Conditions

• Each of these hybrids requires moist to wet, fertile soil with full exposure to sun for best growth. Established trees are tolerant of drought and urban stress. The trees grow well in either alkaline or acidic soil. The trees may be pruned for shape and, when young, to remove lower branches and encourage development of a central leader. Prune them only when they are dormant.