Winter is a great time to prune those bushes. Take a day when the temperatures rise above freezing and the sun is out. It’s nice to finally get out of the house. Now which plants to prune. If it blooms in the spring then don’t touch it. However many plants bloom in the summer. You can prune the paniculata hydrangea, the ones with large cone shaped, usually white flowers. Evergreens, butterfly bushes, most clematis, and I like to prune spirea too even though they bloom in the spring.