Given the right conditions, you bet. Like in the Northwest of America. Washington, Orgeon and some other states in the region list blackberry as one of the most invasive species of the srea.
Yes, they tend to be very difficult to get rid of. Mowing them only ends up encouraging more branching, and digging them out is also difficult. Burning and bulldozing usually do not work either. Regarding digging them out, Joe DiTomaso, a weed specialist with UC Cooperative Extension in Davis and a member of the California Invasive Plant Council, said, “You have to get every piece of the root or it comes back.”
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