[WestwardHo]

Epsom salt,magnesium sulfate, will not increase the acidity of your soil.
Decaying leaves are a better mulch for your lilacs as pine needles contain turpentine, which over time is like added paint thinner to your soil. If it doesn't affect the lilacs, it can kill other things. Pine needles are heavily used in the South for keeping weeds and such down around trees and yard edges. It's heartbreaking to have spring arrive, and no flowers on the lilacs. Even one of those cheap soil testing gagets with the two electrodes that go in the soil will give you a good idea of what your soil needs.

[momtothree]

I am going to start collecting some leaves this weekend and put them near the bottom. Thanks, WWHO! Years ago, I planted a yellow Lilac. I had always wanted a yellow Lilac. I had to wait six years before the plant was big enough to actually bloom. Bloom it did... for one year... one stupid purple Lilac. One! The next year, the stupid thing stopped blooming completely. (I am beginning to think someone up above doesn’t want me to have Lilacs. LOL!)

[tubebender]

I use Mer-Acid on my Blueberries...