Posted: 08/03/2017 at 13:31
Unless you tie summer raspberry canes into a framework it's very difficult to differentiate between last year's canes which will bear this year's fruit, and the new canes which will grow this year. After the old canes have fruited you need to cut them out at the base and then tie in the new canes which will fruit next year. Not doing this will result in a tangle similar to that around Sleeping Beauty's castle.
As autumn fruiting raspberries fruit on the current season's growth they're much simpler to prune, as you just cut everything down to soil level. However I still tie my Autumn fruiting Polka back to the fence as otherwise they form such a thicket - it's much simpler to gather the fruit if they're restrained in some way