This is a very comprehensive answer from NC State University:
http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/shrubs/text/pruning.html
The usual answer is immediately after they have flowered. If you prune them more than once a year they are called a hedge.
Generally, it's towards the end of winter that you trim, prune or otherwise cut shrubs in Pennsylvania. But that decision depends upon two conditions. One condition is the particular pruning schedule of a particular shrub. For example, early spring blooming shrubs generally need their care delayed until after the bloom.Another condition is the reason behind the care. Care may be done any time that the reason may be said to begin with the letter 'D'. Specifically, that means if the shrub is damaged, dangerous, dead, diseased or dying.
trim around
There are a few ways to trim round shrubs. If you want a formal look, use an electric trimmer. This will create straight edges. If you want your shrubs to look more textured, you should use clippers to open up space into the plant.
The best installation tips for vinyl floor trim are to measure and cut accurately, use adhesive or nails for secure attachment, ensure the trim is level and straight, and finish with caulking for a clean look.
The best installation tips for laminate floor trim are to measure and cut carefully, use a miter saw for precise angles, secure the trim with adhesive or nails, and finish the edges neatly for a professional look.
broomm srubs
Trimming a Maple Tree in Maryland is the same as trimming a tree in other states. Just trim off the dead leaves and t weigs making sure not to cut any living plant.
To cut and trim hair for a new hairstyle, start by washing and combing the hair. Section the hair and use sharp scissors to cut small sections at a time. Trim the ends to create the desired shape and style. It's important to work slowly and carefully to achieve the desired look.
recortar = to trim, cut off
if you trim your hair i will grow faster remember only trim it do not cut it trim it
If you trim the lower branches off at the trunk it will become a very large tree, leave the lower limbs and it becomes a bush looking plant. the best time to cut the branches is when it's the coldest in your area. They are very hardy plants and small ones can be transplanted easily in the winter.