Pruning is tricky, and it is hard to keep track of when to prune what. I am constantly referencing books myself. The best pruning times generally fall into two categories — early spring/late fall, or right after the plant blooms. Because so many shrubs and trees bloom in the spring, the time line can become particularly blurry during this busy pruning time of the year. Technically, early spring is just about over... so if you haven't done that pruning yet — do it now.