I am not sure about pruning when it's winter and there is no fruit on the vine. I was told to prune at the end of harvest when the fruit was finished but the caps on the raspberries was still on the vine. This was the identifier of the vine that produced and would not produce again next year. This is the one you cut down to the ground. The other canes, the long bigger ones are the ones that will produce next year. As this case is the end winter and we know not, the question is how do prune now, when everthing looks alike and has spread all over. In my case I have canes sticking up through the cracks in the cement driveway near the raspberry bed. What I am contemplating doing is whopping most of it back unless someone who knows more than I do responds. I can read it in a book but it looks different when you are looking at the bed, AND the bed all looks alike.