Here is some good pruning advice from our fellow Master Gardeners in Outagamie County, Northeast Wisconsin.
Understanding how raspberries produce is the key to getting the most from them. While their roots are perennial, their canes are biennial, dying after the second growing year. In order to prune successfully, you have to know which canes bear when, and that is a function of whether are summer bearers or fall bearers.
Summer-bearing raspberries act like true biennials; the first year is for producing leaves, and the second year is for flower and fruit production. After that, the dead canes just stand around interfering with berry picking. Every year, raspberries send up new canes, so the penalty for not pruning — rampant sprawl and painful harvests — mounts.
The elegant way to prune summer-bearing raspberries is to cut all canes at soil level in the summer, after they are finished fruiting, and then prune out all but the strongest four or five new canes in the spring, once…
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