When do you trim dead parts of a shrub?

Whenever you first see them is when you should trime died parts of shrubs.

Specifically, shrubs and trees tend to have pruning schedules that generally divide into after the bloom on old growth and before the bloom on new growth. But it may be done at any time if there is concern over the rule of the d's: damage, death, decay, disease, dying, never been done. The one rule that cannot be broken is the following: It is o.k. to trim before, but not immediately after, a rain event. Cutting into wet wood can lead to canker.