Cutting Back Lilac Bushes

Q:  I would like to trim my lilac bush down. It is about 15 feet tall and I would like it to be about 7 feet tall. Please let me know how and when to do this.   Edith – Des Moines
 
A:  Wait until your lilac is done blooming (10 to 14 days after) to trim.  You have a very short window of time to do this.  Deep-root feed at the base with  25-10-10 nitrogen pellets.  Also sprinkle two pounds of bone meal on the crown.
If you see new canes, don’t cut those off.  Also, your lilac may not bloom as prolifically next year.