Confusion with cutting back Raspberries.
I've googled how and when to prune Raspberries, and I'm a bit confused. Some websites say cut the whole thing down (even mow over it) after it's fruited. Others say the fruit comes on 2 year old canes, so only cut down the ones you know have fruited already.
I have a very sad looking "Rubus Heritage" in a pot on my balcony. I've put off cutting it back because I don't know what to do, and now I figure I should really do something before spring hits. Do I cut it all back? Is it too late?