The lily flower comes in many shapes, colors and sizes, and is found across the world. The flower offers a sophisticated, graceful aspect to the garden. Some flowers that are thought of as lilies, such as daylilies, water lilies and arum lilies are actually from other groups of flowers, and are not lilies. True lilies grow from bulbs or corms, which store the plant's food and moisture during the dry or cold seasons. Some of the most common summer blooming lilies are categorized as Asiatic or oriental lilies.