Canes have a sharp, ~ 1 ⁄ 3" spine at each leaf axil. Japanese barberry is a thorny shrub, introduced for hedgerow and other plantings in 1875. Identification: Japanese Barberry is a deciduous spiny shrub that grows 2 to 8 feet high. Japanese barberry is an invasive shrub that is native to Japan. Pale yellow flowers hang in umbrella-shaped clusters and appear in April to May. The bark is brown and deeply grooved with a spine at each node. Leaves are alternately arranged in clusters, are 0.5 – 1.5” long, and oval-to-spoon shaped with smooth margins. Japanese Barberry Berberis thunbergii. Shrubs usually have multiple stems and can be upright or spreading and range from 1 – >5’in width. Description: Perennial, deciduous shrub, up to 6' tall and wide, though typically smallery, usually very branched.Branches can root at the tip. Again, there are numerous types to choose from; however, some of the more popular barberry shrub varieties include: Japanese barberry – Japanese barberry (Berberis thunbergii) is the most popular landscape barberry growing from 3 to 6 feet (1-2 m.) tall. Japanese Barberry was introduced to North America in 1875 and had naturalized in the wild by the early 1900s. Identification: Japanese barberry is a small-to-medium, densely branched and thorny perennial shrub, typically 3-6’ tall. By 1910 it was recognized as a frequent garden escapee. This article displays images to assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. 2019 Status in Maine: Widespread.Severely Invasive. Due to the bright berries and leaves that Japanese Barberry produces, it has been widely planted across North America as an ornamental plant. In the 1870’s, seeds of the Japanese barberry were introduced to North America at the Arnold Arboretum in Boston. The tree has small, oval-shaped leaves that may be tinted green, blue, or red. It has long been marketed as an ornamental in the garden trade with numerous cultivars available, sporting a wide range of leaf colors and in forms from compact mounds to 5-foot hedges. Life cycle/information: Japanese barberry is a deciduous, woody perennial shrub. Japanese barberry (Berberis thunbergii) is a hardy deciduous shrub, meaning it drops its leaves at the end of the growing season.While it's considered an invasive species in parts of North America due to its tolerance for many growing conditions and ability to outcompete native plants, it's still commonly grow as a landscape plant. Bright green leaves change to orange or reddish in the fall. Japanese Barberry (Berberis thunbergii) Photo: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org. Now this invasive species is widespread and can persist in forest understories long after a homestead is abandoned. About Japanese Barberry: An Invasive Plant in Maryland. Japanese barberry This plant and the related entity italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Japanese barberry (Berberis thunbergii) is an invasive shrub used in plantings. Berberis thunbergii, the Japanese barberry, Thunberg's barberry, or red barberry, is a species of flowering plant in the barberry family, Berberidaceae, native to Japan and eastern Asia, though widely naturalized in China and in North America. Berries and leaves that Japanese barberry were introduced to North America as an ornamental Plant across North as... 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