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I did pinch my new blackberry canes this year and they sent out 2-3 shoots from that junction! But never grew taller. So probably the same with raspberries. So pinch off at whatever height you want them. Watched a YT on it and so far it's workedI'd read that you can prune them to 3-4 feet and they will grow more side canes the next year. The side canes are where they bear fruit.