Have had lilacs for almost 30 years….first year I had very few blooms although bushes are healthy. Could I have trimmed bushes at the wrong time? We had beautiful weather early April and I did a little trimming. I live in southern NH, zone 5. Thanks for all your tips.
Certified GKH Gardening Expert
This should be done in very early Spring. Pruning late is the most common reason for failure to flower.
Here is an article that will help: