Mile-a-Minute
I've just come in from pulling this plant on a neighboring property (my good deed of the day). The name tells you why this is an invasive plant. It may not grow a mile-a-minute but it seems to as on really good day it can grow 12+ inches, 30 feet in a month or so. The good news. It is an annual and has shallow roots, so if you get out there in early June and pull it as it gets started, it is relatively easy to control. And it hasn't been growing in our area for long. The bad news. If you let it grow it will climb over everything else and take over. It also sets seeds (~500 per plant) which are dispersed by wildlife, wind, rain, and lawnmowers. Take a seemingly innocuous 5 plants growing 12 inches a day and multiply by 500 (if left alone) and a potential 2,500 new plants enter our ecosystem.
Persicaria perfoliata is a synonym for Polygonum perfoliatum, with common names like mile-a-minute weed, devil's tail, giant climbing tearthumb,and Asiatic tearthumb. It is a trailing annual vine with barbed stems and triangular leaves. It is native to most of temperate and tropical eastern Asia, from eastern Russia in the north down to India in the south.
Water is an important mode of dispersal. Its fruits can remain buoyant for 7–9 days, an important advantage for dispersing seed long distances in stream and river environments. The long vines frequently hang over waterways, allowing fruits that detach to be carried away in the water current. During storm events the potential spread of this plant is greatly increased throughout watersheds.(info and photos from Wikipedia)
Introduced in the U.S. by a nursery in Pennsylvania about 55 years ago, it has since spread to cover ~300 mile radius and growing. If we all pull together we can rid our area of this noxious, alien weed. Please share this information with your neighbors.