Answer: Acidanthera is another name for Gladiolus callianthus. This is a perennial with long-tubed, fragrant flowers that bloom in summer. It makes an excellent border or pot plant. The plants grow about 3' tall. They can be left outdoors in zones 8-10. In colder climates they need to be lifted and stored over the winter months. You can force the bulbs to grow and bloom indoors, but at the end of the season the foliage will die back and the corm will go into a resting state over the winter months. In the spring it can be planted again and will sprout new foliage and flowers.
Since glads are summer bloomers the corms should be planted in the spring. You can plant in pots, but you'll still need to lift and store the corms at the end of the season rather than keep them in pots indoors (where it will be too warm). After the foliage yellows and dies, cut it back, lift the corms, and store them in dry peat moss or sawdust in a cool, dark area such as an unheated garage.
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