Preparing for fall
What is the best time to prune back large bushes and lilacs?
Lilac's are best pruned in the spring, following their bloom period.
Pruning of most shrubs will depend on if they form flowers on old or new wood.
It is best to research the information on each plant type specifically.
Use the search tab at the top of the page for articles about your specific plants.
Here is a link about Lilac pruning.