I am actually trying to eradicate a 20 year old mislabeled blackberry thicket that started with a thorny single plant. I cut them down to 9 inches and painted fresh cuts with a formulation of Roundup for Poison Ivy (last resort). They still look green to me, and the stubs are a safety hazard. Any suggestions? The canes are as thick as rod pretzels, or better.
- Lisa
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