Lilies are some of the most recognizable and popular flowers in the garden, vases and bouquets. Lily flowers are available in many different colors, bloom times and heights. Some lily flowers are also very fragrant. Lily bulbs can be planted in the spring or the fall. Like other flower bulbs, they grow best in well-drained soil. These sun-lovers look best when planted in groups. When selecting the best lilies for your garden, take into account their mature height. While border lilies may only grow 14-18 inches tall, Asiatic, Oriental and other lilies often grow 3-4 feet tall. Some giant lilies can grow up to 8 ft. tall! Other considerations include flower color, flower form, fragrance and bloom time.