This could go in Edible plants 'cos it is or Pests and Diseases, cos it is. This rotten stuff has self seeded all over the place and as it is one of those plants which sends down a tap root long before it gets any leaves, so by the time you see it, there is an antipodean person pulling on the other end, the question is Are the roots persistent as dandelions or dock are. I cannot use weedkiller in this place as there are still leafed Camassia's and other things. All I can do in most places is to pull out as much root as possible, but do they regrow from the residue? Anyone ever tried to get rid of it?