Help! My vegetable garden is being invaded by this awful weed Canada thistle. Can anyone offer any suggestions please? I read that I should prevent them from going to flower and then seed by pulling all greenery. This may also prevent nourishment to the horizontal root system. Any truth in this?
My allotment was full of thistle last year when I took it over. I did not remove any of the thistles. I cut them to the ground and covered in cardboard and compost.
It is now a year later. Thistles do emerge here and there and I pull them whenever I spot them, mostly at a very small stage when they are not too prickly to pull by hand. They are appearing less and less, so I guess this approach works.