Flower bulbs are some of the easiest flowers to grow in the garden and containers. When considering flower bulbs to buy online, remember there are more varieties than just tulips, daffodils, lilies and crocus. Burgess Seed & Plant Co. offers some flower bulbs that you won't find at just any retail store—and they're definitely worth adding to the garden. When choosing flower bulbs to buy, consider their bloom time, height, light requirements, hardiness zone and flower color. Also note whether they are spring-planted or fall-planted flower bulbs. Regardless of planting time and light requirements, most bulbs require well-drained soil and benefit from an application of slow-release, all-natural fertilizer.