How did you get rid of Perennial Sowthistle Sonchus arvensis
I've got an infestation of Perennial Sowthistle in my garden and wonder how you got rid of yours? I'm in an area of Ontario, Canada where chemical pesticides are banned.
Because it spreads underground by a huge inter-twining root highway, I'm thinking of building myself a soil screen and digging up my garden area-by-area and attempt to control it that way.
Any less 'back-breaking' ideas out there??