Eeek! Here we are trying to come across all professional and wise and we plain forgot to mention autumn fruiting raspberry canes in our February newsletter.
So, the point was: if you have autumn fruiting raspberry canes, February is the last chance you will have to prune them right down to the ground. You could, of course, have done this earlier as long as they had finished fruiting.
Autumn fruiting raspberries - Autumn Bliss, Joan J and Polka, for example, need to be pruned like this for you them to crop well each year.