This video describes nine common mistakes people make in trying to control invasive knotweeds like Japanese knotweed (Polygonum cuspidatum or Fallopia japonica).
00:13 - Mistake No. 1: Trying to kill knotweed by repeatedly cutting or mowing it
01:00 - Mistake No. 2: Trying to kill knotweed by covering it with just tarps or landscape fabric
01:58 - Mistake No. 3: Doing an herbicide treatment too early in the growing season
04:42 - Mistake No. 4: Doing only one herbicide application
05:50 - Mistake No. 5: Cutting knotweed in summer before a fall herbicide treatment
06:40 - Mistake No. 6: Lack of persistence in staying after the knotweed.
09:30 - Mistake No. 7: Waiting too long to plant native plants to compete with the knotweed
10:38 - Mistake No. 8: Not knocking down dead knotweed stems the season before treatment
11:25 - Mistake No. 9: Not doing anything!