Rugosas are tough; prune now (before last frost May 15). They may resent old-wood pruning, causing dieback, but generally handle it well.
Fertilize only in spring, preferably with organic fertilizer for even growth and a balanced bush.
Pruning Your Summer-Blooming Hydrangea (Snowball Bush): Timing and Technique
Clematis Pruning Guide: When and How to Cut Back Your Vine
Rose Pruning: Late Winter + Sulfur Spray
Azalea Pruning: Timing and Technique for Maximum Blooms
Pruning a Snowball Bush (Viburnum) for Better Blooms
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