I inherited raspberry bushes when we bought this house. How am I supposed to prune them? I had thought the berries only grow on Old canes, so I’ve just been leaving everything alone.
It depends on whether they are early or late bearing berries. My main ones are red Heritage raspberries which will have a small early crop on last year's growth but the main crop is in August and September on new growth.
If you have late bearing ones you can just cut them to the ground. If you have early bearing one you have to remove the canes that are two or more years old keeping last year's new canes.
I found this http://www.finegardening.com/article/pruning-red-raspberries