Leo are mid/late summer fruiting, so, don't prune them - they will produce fruit on the old canes that over-wintered. New growth will then come this year. After the old canes have finished fruiting, cut the old canes back and leave the new growth to stand over winter, so it can produce fruit in 2008. You might find it handy to loosely tie loops of string around the old canes now, so that you know exactly which ones to cut down at the end of summer.