I have two thornless blackberry plants in wooden pots. the post have several 1" holes drilled on the bottom for drainage and for the roots to decend. There are also rocks at the bottom for drainage. The problem is that the edges of the leaves are turning brown. I have read conflicting information about too much water and not enough water. I have feed them but they were brown before that. One of them has new growth. I dont want to lose them. I live in the southeastern corner of Arizona but the plants said heat tolerent.
