Is horticultural vinegar a viable alternative to other chemical sprays. Is it ecologically less damaging to environment! Is manual removal with tractor, weed eater aan trees a better management option.
Lane County Oregon blackberries
The vinegar will only burn back the tops. Established blackberry patches can have a root system comparable to a small tree. Manual removal is definitely the better option, but must be repeated as stray sprouts come up. I am not sure what you meant about the trees.