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 are shaded as the trees grow larger around them and also many Lilacs are plant in one direction light. This means one side flowers more than the other.
Moisture
average
Soil & Site
average, doesn't like soggy wet
Flowers
panicles of single bluish to lavender blue florets, fragrant
Fruit
seeds in loose clusters of brown beaked dehiscent capsules
Leaves
simple, green leaves, may suffer from powdery mildew in the fall, best planted where it has good air circulation
Stems
raised lentcels on stems
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
Since Lilacs bloom on next season’s wood, prune after they are done blooming. There are many different ways to prune a Lilac. The most drastic is to cut them down to the ground. I have had ones sucker back and regrow while others that didn't make it using this method. 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. Drastic pruning may delay flowering a few years
Propagation
division of suckers, cuttings
Native Site
Lilac is native to Europe and has been in cultivation since the 16th century.
Cultivar Origin
A Father Fiala introduction (USA).
Notes & Reference
R#1-Manual of Woody Landscape Plants (Michael Dirr), #93-North American Landscape Trees (Arthur Lee Jacobson), #104-Lilacs “A Gardeners Encyclopedia” (Fiala), #144-Missouri Botanical Gardens web site))