The Japanese tree lilac has cherrylike bark and grows 25 to 30 feet in height. It extends the lilac season by flowering in mid June, after the shrub lilacs. Its blossoms are initially rose-colored, then quickly turn creamy white, emitting a soft, sweet aroma like that of privet. Hardy in zones 3-7. Proper name: Syringa reticulata. It also makes an excellent bonsai!