Invasive Plants are all around us.  Many have "hitchhiked" here on material imported from other countries.  However, Many of them were intentionally introduced because they had horticultural interest.  Being non-native, they have no native predators.  For many introductions, this is not a problem.  However many of these plants turn out to be aggressive growers that threaten the native varieties that help sustain the insects and animals on which we depend.  Here are some links that give lots of info about invasives!

The PDF below will give some directions on how to eliminate Knotweed!