Lilac (Syringa) is a perennial gardening favorite for its indispensable sweet scent and unique form. Considered trees or shrubs, lilacs are the one bush your yard or garden can’t do without. Yellow, white, pink, lavender or even bicolor, a lilacs’ unique, bright flowers offer a stunning display. Try a Reblooming variety to enjoy the fresh fragrance and charming color of a lilac all summer long.