When to Trim Blueberry Bushes

Q: When do we trim blackberry bushes that have finished bearing? Ours have
several really tall green canes. They are so heavy they are leaning over. 

A: You should prune blackberries a few weeks after harvest. This will give
you enough time to note the new canes that emerge to replace the canes that
fruited. Canes that had fruit will not bear again and can be cut back to the
ground. The replacement canes can be shortened as needed to fit your trellis. I
recommend you cut your tall canes back to a reasonable picking height so they
can grow side shoots during the summer.

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