full, I have been asked many times "Why doesn't my Lilac flower as good as before". The reason is usually the amount of light. Many plants get less light as the trees grow larger around them. Also Lilacs are plant in one direction light. This means one side flowers more than the other
Moisture
average, doesn't like soggy
Soil & Site
average, doesn't like soggy wet
Flowers
lilac purple or pale pink, borne in an upright panicle, fragrant
Fruit
beaked dehiscent brown capsules
Leaves
simple, green leaves, heart shaped , little if any fall color, may suffer from powdery mildew in the fall, best planted where it has good air circulation
Stems
raised lenticels on stem
Dimensions
8-15 feet high by 1/2 to 3/4 spread, too large for use near the house, best used as specimen plants or in shrub borders, can be used on corner plantings as long as given 6-8 feet from the corner
Maintenance
There are many different ways to prune a Lilac. The most drastic is to cut them down to the ground. Using this method I have had ones sucker back and regrow while others that didn't make. You can cut out the old stems and let the new suckers fill in thinning them to the desired amount. On many old plants we have removed all the suckers and left a few of the old stalks. Pruning them up to bare base stems, turning the plant into a small tree. Width can be controlled by pruning them back 1-2 or more nodes. Drastic pruning may delay flowering a few years. Since Lilacs bloom on next season’s wood, prune after they are done blooming
Propagation
dividing off a sucker, softwood cuttings, grafting
Native Site
Lilac is native to Europe and has been in cultivation since the 16th century.