They can handle a bit heavier pruning in spring.
So a compromise may be for some varieties of holly: prune in December every other year.
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Doing a Drastic Pruning. Assess your azalea. You probably don't need to do a drastic pruning unless you have a Southern Indian azalea that has gotten quite large. If your bush has started to obscure windows and take up room you'd like to use for other plantings, you can trim it back drastically without causing long-term harm.
These are prone to damage if fed with chemical fertliisers.
Growing Azaleas. Azaleas prefer loose, moist, well-drained soil for their roots. If the soil is heavy, mix it with as much as 50% organic matter, such as fine pine bark or rotted leaves, before using it to plant the azalea. When choosing such soil amendments, avoid materials which may be alkaline or “hot” (containing fresh manure), such as. Apr 02, Examples of some shrubs that fall in this category include lilac (Syringa spp.), azalea, forsythia, fothergilla, kerria, mockorange (Philadelphus coronarius), rhododendron, and weigela.
Prune shrubs using the renewal method in which some of the largest stems of the plant are cut to the ground.