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Depends, are they summer or autumn fruiting raspberries?
Hi Dave, thanks for the reply, the canes are summer fruiting and were bought from a local reputable source.
Hmm. If they have flowers on them I'd cut them down again. It's a bit late in the year for summer fruiting ones but that's what I'd would do.
The alternative is to cut half of them down and see what happens next year. It sounds like they haven't quite caught up with the initial planting.