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garlic mustard (Alliaria petiolata)
ODA rating: B and T
USDA Symbol: ALPE4
Oregon garlic mustard distribution
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Images courtesy of Glenn Miller, Oregon Dept. of Agriculture

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Biennial; rosettes form by midsummer the first year, blooms May to June second year. Grows an average of one to three feet tall. Basal leaves dark green, kidney shaped, scalloped and two to four inches in diameter. Stem leaves alternate, sharply toothed, triangular, get smaller towards the top of the stem and produce a distinct garlic odor when crushed. Flower stalks usually single and unbranched. Flowers one quarter inch wide with four white petals that narrow at base.
Garlic mustard displaces native forest under story species, reducing diversity and decreasing forage availability for deer. Frequently invaded habitat types include forest opening edges, roads, streamsides, trails and agriculture land; it thrives in the partial shade of oak savanna. Displacement occurs rapidly, often within 10 years of establishment. This plant is very difficult to control once established
Distribution in Oregon
The first documented site in Oregon was 1959 in Multnomah County.
Garlic Mustard in Oregon Distribution map legend
Biological controls
No approved biological control agent is available at this time.
Informational links
Garlic Mustard printable trifold(pdf)