The plastic ought to extend 5 to ten toes exterior the boundary spot on the knotweed progress. Use rocks or other weighty resources to weigh down the tarps, so they do not transfer or blow away. As this masking will require to stay in position for years, disguise it with https://japanese-control64207.designertoblog.com/68982423/the-definitive-guide-to-japanese-knotweed-control