hi there, i have raspberry canes aswell, all i do is give them a good cutting in march, cover with a built frame about 8ft high and cover with a net, 2 years ago i never realised what to do with them so i just left them, i got a good crop and when they were all nice and ripe the ruddy birds came ove and ate them on me!!! i've wisened to them now though.
Good luck anyway
Danny lewis
::) ;D ::)