In U.S. Department of Agriculture hardiness zones 7 and 8, dig up gladiolus bulbs after the foliage has died and before the ground freezes. Gladiolus bulbs are food-storage structures called corms.
- Dig up the plant with a spade, being careful not to damage or bruise the corms. Cut the stem back to 1 inch. Discard any damaged corms. Remove the old corms from underneath the new corms.
- Shake off the soil and allow the corms to dry in the sun for 2 days. Cure in a well-ventilated location at 80 to 85 degrees for two weeks.
- Store the corms in trays with screened bottoms, onion bags, or paper boxes and bags. The environment should be dry and a constant 35 to 45 degrees. Do not allow them to freeze.