Tall, colorful gladiolus make outstanding floral displays. Planting gladiolus bulbs is an economical way to bring attention to foundations, focal points and more. Gladiolus flowers cover tall, straight stalks--creating a dramatic and beautiful garden display. Though they are considered perennial plants, gladiolus bulbs should be lifted in fall in zones 3-7. Wait until the first frost has killed off the foliage above the ground before lifting. They can then be replanted in the spring planting season, and for years to come. Consider gladiolus bulbs for sale in a mix of colors for lasting appeal.