Blackberry is regarded as one of the worst weeds in Australia because of its invasiveness and potential for spread. Bushes grow actively late spring to early autumn.
For best results cut much of the tree as possible. Cut into the roots & brush the trunks with Richgro Tree, Blackberry and Woody Weedkiller. Drill holes & pour solution into the hole. For best results, cut much of the tree as possible before applying the solution.