Japanese Tree Lilac (Syringa reticulata)

Key Identification Features

Description

Japanese Tree Lilac is an ornamental plant that can and does spread into natural areas. The plant is a large woody shrub or small tree reaching up to 30 feet in height. The leaves are oppositely arranged and oval shaped with smooth margins and a tapered tip. Large bunches of tiny white flowers are produced in early summer that are fragrant. In late summer, green seed pods are formed that can turn brown and persist into winter. The bark of the plant is smooth with many horizontal slits.

Native Range

Japanese Tree Lilac is native to northern Japan and was introduced into North America for cultivation in 1876.

Habitat and Dispersion

Grown intentionally in urban areas, this invasive shrub is tolerant of a range of conditions. It prefers moist soils that drain well and are slightly acidic. It also prefers full sun. These are not necessary, however, as the Japanese Tree Lilac will also grow in poor quality soil that is dry, or compacted. It can often be found in riparian corridors and floodplains. The flowers of this plant are insect pollinated and eventually produce seeds and seed pods. 

Best Management Practices

The most successful management is to avoid intentionally planting Japanese Tree Lilac. Educating others about the threats of planting non-native plants is also always helpful. For small Japanese Tree Lilacs, hand pulling can be effective. For larger plants, cutting and application of herbicide by professionals will aid in mitigating infestations.

Additional Resources