The Common Lilac is also known as the French Lilac.
If you plan to prune the Common Lilac, it should be pruned after its flowers fade to ensure best blooming next season. To keep the bush more dense, prune one half of the new growth off each season. Alternatively, you can leave this shrub grow naturally and the growth habit will be a little less dense. This shrub displays excellent drought resistance once it is established. While this bush will grow in part shade, full sun will yield the best growth and flower density.