How do I prune a raspberry plant?

Cut it down to 3 ins above ground level in February.

Depends whether it is summer or autumn fruiting. Summer-fruiting raspberries, like blackberries, fruiting on one-year-old canes that are cut out after harvest and then replaced by the young canes. Autumn-fruiting varieties, however, are cut to the ground in late winter to make way for new canes that will grow from the base and fruit the same year