Mile-a-Minute has been known for the past 20 years from Washington County where it has spread inland from the Ohio River bank it was first found on. Worse news is that it has now been found in Lawrence County. The offender's painfully sharp prickles are known to cut into human and animal skin, earning it a nickname of "tearthumb". Its aggressive growth of up to 6 inches a day should be a concern to any landowner in the area. The culprit: mile-a-minute vine (Polygonum perfoliatum).