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Japanese Barberry, Berberis thunbergii, infestation

Japanese Barberry

COMMON NAME:

Japanese barberry

SCIENTIFIC NAME:

Berberis thunbergii

ORIGIN:

Japan

DESCRIPTION:

Japanese barberry is a deciduous shrub that can grow 8 ft. tall. It has grooved stems with single or paired thorns in the nodes. Its leaves are ½“ to 1 ½” in length and grow in irregular clusters. In April and May, japanese barberry produces umbrella-shaped clusters of white flowers on the undersides of its branches. The red, oblong fruit are produced in September.

ECOLOGY
RESOURCES
DISTRIBUTION

HABITAT:

Japanese barberry is drought resistant, and survives in both full sun and full shade, allowing it to invade a variety of habitats. It is common to see barberry forming dense thickets on forest floors, though it will also grow in open areas and disturbed sites.

THREAT:

Japanese barberry has been linked to Lyme disease. In areas with large infestations of japanese barberry, there may be a 90% increase in Lyme-disease-carrying ticks when compared to areas with native shrubs. This is likely due to the fact that japanese barberry provides excellent cover for deer mice, the larval deer tick’s host, and helps retain humidity, making it an ideal habitat for ticks. Japanese barberry has also been linked to increases in invasive earthworm populations and in soil erosion.

MANAGEMENT:

Smaller shrubs can be pulled. Larger shrubs and infestations can be treated with herbicides. Herbicides may be applied to japanese barberry in early spring and late fall, when native plants are dormant. Plants may be foliar sprayed or treated using cut-stump methods.

WNY PRISM PRIORITY:

Tier 4 - Local Control
NYS Invasive Species Tiers Chart

ADDITIONAL RESOURCES:

Native Alternatives
Ninebark (Physocarpus opulifolius)
Northern spicebush (Lindera benzoin)
Black chokecherry (Aronia melanocarpa)

NYS Prohibited and Regulated Species - Part 575:

Japanese barberry is a prohibited species in New York State - for more information on Prohibited and Regulated Species, visit http://www.dec.ny.gov/animals/99141.html.

PATHWAYS OF INVASION:

Japanese barberry was introduced to the United States as an ornamental plant. It spreads by seed and by vegetative means.

REGIONAL DISTRIBUTION:

Widespread

MAP (via iMapInvasives):

This map shows confirmed observations (green points) submitted to the NYS Invasive Species Database. Absence of data does not necessarily mean absence of the species at that site, but that it has not been reported there. For more information, please visit iMapInvasives.