Blackberry Bush Won’t Produce Fruit
I planted what I was told was thornless blackberries 2 years ago. The bushes have grown and spread out, but they never bloom and make berries, just brown stubs.
Certified GKH Gardening Expert
There are several reasons that a blackberry might not grow fruit that you can read about here: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm