How to support and maintain raspberries. Building a wire support is necessary for growing your own raspberry bushes. Raspberries will need support as canes grow tall and can fall over when heavy with fruit. If you are growing in a small space a single post for every 2 plants will be more practical but if you have the room you are better growing a number of canes along a post and wire support fence. The beauty of soft fruit canes and bushes is once planted they will produce abundant crops for 10 years or more before the bush starts to decline.