What is the garden use of lilacs?

Lush branches and leaves, large inflorescence, elegant color and fragrance. It is widely used in gardens in northern provinces of China. There are also many kinds or varieties of lilacs used for landscaping, such as blue lilacs (southern lilacs, narrow-leaf lilacs and flat-leaf lilacs), with dense inflorescences, dark purple calyx, blue-purple corolla and slender tube. S. Persica, the shrub is 2m high and the twigs are slender; Panicle scattered, large and long, with lilac corolla and slender tube; Usually it doesn't bear fruit, but it blooms in May. A lilac (variety Albarede) with white flowers; The leaves are smaller. Double white clove. Planat.), white, double.