Our "landscaping crew" recently severely pruned (hacked) our lilac bushes and shaped them into a "hedge". Approximately 75% of the foliage / leaves has been removed, with many bare spots and exposed branches sheered off. I am sick over the whole incident, but want to try to reduce the shock to them to hopefully get them back on track. What can I do to help protect them and promote regrowth? Also, should I remove 1/3rd of old growth at the base in the fall or will the bushes still be in too much shock from the severe pruning? Thank you for your response.