To keep your lilacs looking their best, they need to be pruned, fertilized and shaped almost every year, soon after they are done blooming in the late spring.
Burning the slash left behind after a logging operation isn't the only method for getting rid of it. Among the alternatives are piling but not burning, "forestry mulching," creating biochar and doing nothing.
Q: I have a California lilac tree in my back yard. A thick root is underneath the pavers and lifting them up. Will I kill the tree if I cut out that root? I sure don’t want to kill it!