• Lilaclilac image by Henryk Olszewski from Fotolia.com
  
  Lilacs, related to the olive tree, are popular for their showy, fragrant blossoms. There are numerous varieties of this small tree, any of which can brighten up a yard with their lacy, delicate flowers. Lilac flowers typically bloom the middle of spring to early summer, but that can vary from species to species.
  
  

Common Lilac

• The common lilac, which comes in both white and purple varieties, is one of the most popular type of lilac shrub. According to Nature Hills Nursery, their flowers emit one of the most powerful fragrances of any plant. Common lilacs have a good reputation for their hardiness. They can withstand deep freezes and, according to Nature Hills Nursery, actually do poorly in regions that don't frost over. The common lilac's flowers grow together in tight clusters and its branches actually grow out of the base of the tree. They grow best in USDA hardiness zones 3 through 7.
  
  

Chinese Lilac

• The Chinese lilac is one of the larger varieties of lilac. It produces purple flowers, typically in May. The Chinese lilac is one of the more prolific boomers as its flowers tend to cover most of the shrub when in bloom. Chinese lilacs grow best in regions that get full sunlight. They can survive in partial shade, but you won't get as many flowers. Just like the common lilac, they grow best in USDA hardiness zones 3 through 7.
  
  

Donald Wyman Lilac

• The Donald Wyman lilac is one of the more distinct types of lilac. It blooms later than most, in late June, and produces singular purple buds that open up into purplish-red flowers. According to Nature Hills Nursery, the Donald Wyman lilac's flowers are more delicate than the the traditional lilac and have a spicier scent. This shrub also tends to attract bees and birds. The Donald Wyman grows best in USDA hardiness zones 2 through 7 and needs a lot of sun, regular water and good air circulation to thrive. These shrubs can grow up to 10 feet in height.