Berberis thunbergii (weed)

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Berberis thunbergii foliage (click on image to enlarge it)
Author(s): James H. Miller, USDA Forest Service
Source: IPM Images

Berberis thunbergii (weed) DC. - (Japanese barberry)

This plant is native to eastern Asia and an invasive, spiny shrub in eastern North America. It can grow to a height of around 2 m, forming dense thickets in forests. It has been associated with elevated populations of the tick Ixodes scapularis.

Dispersal is through animals which eat the fruits, or it is introduced deliberately as an ornamental. It is controlled mechanically and through herbicides. Mechanical control should include the roots which can sprout to form new plants. The leaves are green to blue-green, oval and 3-5 cm long. The branches are grooved and the thorns about 1 cm long. The flowers are pale yellow and the fruits are egg-shaped and orange to red.

Vernacular names
• Deutsch: Thunberg-Berberitze
• English: Japanese barberry
• Français: épine-vinette de Thunberg