When I was growing up, we had a lilac hedge separating two of our yards, and I always loved the lilacs. Although I am sure there were several individual lilac plants involved, I always thought of them as being one thing. As I remember it, they bloomed for quite a while during the summer, and the smell of lilacs is wonderful. Plus, they were very thick. As a young child, I would tunnel along the bottom of the lilacs. They provided protection for birds that would nest in them and, while dad would sometimes trim them, squaring them off at the top, some years they were allowed to grow higher. I planted one lilac shortly after we moved here and added four more later. One of the newer ones didn't green up after a hard winter but the others are still alive and well, but they grow very slowly and mine only bloom for about a week. I just bought a couple more that I am going to plant, although my posthole digger is not enough for me to dig a hole where I want them to be, so I am going to have to get out some bigger guns. I have a wrecking bar around here somewhere, I think, or I may have brought it up north. Maybe a pickaxe, but I'd have to buy one of those. Our yard consists of coal ash and rocks once you get down beyond a few inches so, when planting something like a tree, I have to dig out a much larger hole than if I were planting it in normal soil, in order to provide room for the roots to expand, and I'm thinking that maybe I'd like to dig out an even larger area than I did with the other lilacs since that might have something to do with their unusually slow growth.