Flower bulbs are often easy to grow and low maintenance. Growing some of the lesser known bulbs, such as crocosmia, liatrus and tuberose, is both fun and rewarding. When choosing what flower bulbs to buy, first make sure they will grow in your hardiness zone. Next, consider their mature height and spread. Because many flower bulbs look best planted in groups, check to see how much garden space you'll need. While most flower bulbs grow best in well-drained soil, their sunlight requirements may vary. Some flower bulbs prefer six or more hours of direct sunlight daily while others don't need that much sunlight. Finally, take into account bloom times, flower forms and colors.