University of Maryland Extension

Japanese Barberry

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Japanese Barberry
(Berberis thunbergii)

Japanese barberry
Photo: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

About Japanese Barberry: An Invasive Plant in Maryland

Life cycle/information: Japanese barberry is a deciduous, woody perennial shrub. It is used commonly in landscaping due to its easy maintenance, adaptability, and tolerance of dry, poor soils and urban conditions. It is a popular choice due to its resistance to deer browsing. First introduced as an ornamental plant in 1875, it has escaped cultivation and forms thickets in woodlands and other habitats. Its dense foliage creates an ideal humid environment for black-legged ticks (deer ticks) which can carry the pathogen that causes Lyme disease.

Growth habit: Fine-leaved, dense, invasive shrub. Grows 2 to 8 feet high. Leaves are ½ to 1½ inches long, oval-shaped to narrow at one end. Color varies by cultivar and can range from green to red to dark purple. Branches usually have small single spines where the leaves join the stem. Pale yellow flowers bloom from mid-April to May. Produces bright red berries about 1/3 inch long in late summer. Leaf litter changes soil chemistry and biological activity, reducing suitability for some native plants. Many cultivars of Japanese barberry are available; all are considered to have invasive potential until research proves otherwise.

Japanese barberry infestation
Photo: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

Reproduction: Spreads by seeds dispersed by birds and small mammals. Sprouts from rhizomes and branches that come in contact with the ground (layering). A single shrub can form a dense impenetrable mass. White-tailed deer prefer not to eat Japanese barberry, which increases its survival.

Japanese barberryy fruits
Photo: Chris Evans, University of Illinois, Bugwood.org

Conditions that favor growth: Tolerates full sun and deep shade. Highly adaptable to many habitats including forests, wetlands, pastures, and meadows. Forms dense thickets and displaces native species.

What to plant instead: Highbush blueberry (Vaccinium corymbosum), Sweet pepperbush (Clethra alnifolia), Northern bayberry (Myrica pensylvanica)

Controlling Japanese Barberry

References

  • Kaufman, Sylvan Ramsey & Wallace Kaufman. 2007. Invasive Plants: Guide to Identification and the Impacts and Control of Common North American Species
  • Swearingen J., K. Reshetiloff, B. Slattery, and S. Zwicker. 2002. Plant Invaders of Mid-Atlantic Natural Areas. National Park Service and U.S. Fish & Wildlife Service, Washington, DC.
  • Japanese Barberry, Maryland Invasive Species Council webpage.

Compiled by Christa Carignan, reviewed by Debra Ricigliano, University of Maryland Extension, 5/2018.

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