Generations of gardeners have loved lilac bushes for their beauty, elegance and wonderful fragrance. One of the most popular and recognizable spring-flowering shrubs, lilac bushes are available in a variety of sizes and flower colors, including pink, white, red, purple or blue blooms. Their panicles make showy cut flowers that can perfume a room. They attract hummingbirds and butterflies, too. Lilac shrubs may be massed to create an informal hedge or planted near entrances or walkways where visitors can delight in their fragrance. Factors to consider when buying lilac bushes are their hardiness zone, flower color, bloom time, light requirements, and mature height and spread.