June-bearing Red Raspberries
The suckers, originating from the root system, will fill in the entire length of the row. No summer pruning (except for spent floricane removal) is necessary, although suckers growing outside the 12-inch hedgerow may be removed at any time. March is the best time to prune in Pennsylvania because any cane dieback from cold will be apparent; however, raspberries can be dormant pruned any time canes are fully dormant. In the dormant season, remove canes outside the 12-inch width of the row, thin canes to 6 to 8 inches between canes, and top remaining canes to 48 to 60 inches in height, removing about one-fourth of the cane. Be sure to retain those canes with the largest diameter.