http://www.backyardgardener.com/plants/graspberry.html
Subsequent pruning In spring, as soon as the growth buds on the raspberry canes may be seen to be swelling, cut back the canes still further-to a visibly live bud about 25cm (10in) above soil level. The idea of this is to leave just sufficient top growth to keep the roots active. No cropping must be permitted the first season and, after this cutting back, new suckers will spring up from the roots and these shoots are the ones, which will fruit, in the second season. Once these new shoots are growing well, the old 25cm (10in) high pieces should be cut down to soil level.
In the second summer, when the fruit has been picked, cut down all the fruited canes right to soil level. New canes now springing up should replace these. If there are more than five or six, select the best of even size, removing any odd extra-vigorous canes and any growing up between the rows at a distance from the main rootstocks. All pruning should at once be burned to prevent the spread of disease or pests.
The new canes should be tied in to the horizontal wires individually as they grow.
In the following February the canes should be tipped, making the cuts to growth buds some 16cm (8in) above the upper wire. This will stimulate better growth lower down where the berries are less liable to suffer wind damage.
Autumn-fruiting varieties should have canes cut out in February and the new growths will then fruit the same year.
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