This Asian vine, introduced to North America in the 1930s, is spreading rapidly, and considered a
serious invasive threat.
Identification: I first encountered this vine on a rainy
afternoon at my sister's home in Phoenix, MD. It had engulfed nearly everything else, except
for tall black walnut trees, in the wooded area behind her yard. It grows up to six inches per day,
and is as effective as oriental bittersweet or kudzu at overwhelming and killing native plants.
Mile-a-minute vine has leaves that are almost perfect triangles, small curved barbs along its
stems, and saucer-shaped leaves (ocreas) at its stem nodes. It develops tightly packed clusters of 10-30 lobed
blue fruits, each about ⅛-¼" (3.2-6.3 mm) around.