How and when do you prune blackberry in the winter?
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Pruning should be done in the very late winter like just before spring comes. Wait as long as you can before they begin leafing out
I always prune mine after they finishing producing which down south is in the fall.
I've attached my blackberry tips here:
https://www.gardenupgreen.com/product/grow-blackberries
Early Spring and Winter Pruning. In winter or early spring, prune primocanes by removing damaged, diseased or crowded canes, leaving four to six healthy canes for each plant. Also, at this time, prune back any lateral or side shoots down to 12 to 15 inches to encourage larger fruit.