Nothing says spring quite like tulips. Some of the most popular spring-blooming bulbs available, tulips add color, cheer and elegance to the garden, bouquets and vases. Most tulips grow well in zones 3-8. Like other flower bulbs, they grow best in well-drained soil. Tulips bulbs are planted in the fall. When considering what tulip bulbs to buy online, you have many choices. If you want to extend the tulip season, choose a variety of tulips, including early season bloomers, mid-season bloomers and late-season bloomers. Also, consider your garden space. Tulips look best planted in groups, and they prefer full sun to part shade. Their heights can vary. Finally, consider the flower colors and forms.