How To Prune An Old Established Leggy Lilac

Question

All the leaves and flowers are at the end of a bare branch

Answer 1

This is going to take some rejuvenation pruning. Drastically pruning down at least 1/3 of the shrub and removing crowded growth in the center will definitely help. After that, you will want to do some annual pruning. Here are some articles that will help:

https://www.gardeningknowhow.com/ornamental/shrubs/shgen/rejuvenation-pruning-tips.htm

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm

https://www.gardeningknowhow.com/ornamental/shrubs/lilac