I have read several of the postings on Lilacs not blooming. My 4 lilacs are on the side of the driveway and we keep them hedged. Mostly trimmed in the spring about this time of year the area that they are in is filled with rock and is not excessable to add dirt or compost etc. The lilacs are 9 years old and ever since we planted them we hav only received about 3 blooms each year. I know that it takes a while for them to mature, but I am now starting to get a little worried that I will never get blooms. Is it likely that because we Hedge ours at 5 feet every spring after bloom that it is keeping it from blooming next year. Im pretty sure we are not cutting off the buds because we never hedge after May. Any suggestions?