Bulbs, corms, tubers and rhizomes all have a place in a garden. They are a plant-them-now, enjoy-them- later proposition, unlike the established plants purchased at a garden center. Bulbs, tubers and corms are an energy storage unit that grows roots, leaves, stems and flowers months after they are planted. A collection of hardy bulbs will give your flower beds, and areas under trees, flower s that will return for several years. Many bulbs will reproduce, giving you the bonus of more plants over the years. Bulblets form at the base of the mother bulb on gladiolus and along the underground stem on some lilies. Other bulbs make bulbils, or tiny, new bulbs, up toward the top of the flower stems. Tulips, hyacinth and daffodils grow and bloom from bulbs planted in the fall. Lilies grow from bulbs planted in the spring or the fall. Tall, stately, Gladiolus grow from spring planted corms; crocus bloom in late winter snow from corms planted in the fall. Corms are actually stems. They