The discussion about Himalayan blackberries sufficiently addressed, I’ll just add that I was taught by the natural resources staff for the Forest Steward program on Mercer Island the following method of removing blackberries:
Cut the canes starting from the top into 8” to 12” pieces. Let them fall where they may. When you’re down to about 8” left, dig out the roots. Keep doing that over the area of work. Rake up the pieces and root wads into a pile and let them compost on site.
I find this method prevents them from attaching to my sleeves, jacket, pants, hat, and what all. Likewise prevents lots of cursing. Lots of fun!
