As I've written recently, I got no blooms on my lilacs this year. I've gotten good blooms every other year (they are about 4 years old), so I was surprised at first by the lack of blooms. But then I realized: I had cut suckers off my two main shrubs and spread them around the garden. I'm guessing the main shrubs chose to re-establish their root systems rather than produce flowers. The leaves look fine, so I should get blooms next year.