Blackberries - died after 2nd winter?
These are my first blackberry bushes so I'm pretty new with growing them. I think I planted them (I don't know what kind) about 3 (or 4?) years ago, and they have gone through 2 (or 3?) winters. They did fine the last winter and in the spring-summer grew huge, with lots of nice big fruit and propagated themselves all over the area. Now this winter has passed and while my raspberries are starting to shoot out new growth, the blackberries look very dead except for a little new growth at the base. The vines/branches look dried out, brown, and dead. Is this typical? Do most people have to prune and start from scratch after a few winters? I live in Iowa, by the way.
Thanks for reading this and any suggestions you may have!