Gladiolus flowers bring incredible color and drama to the summer garden, but once frost arrives, it is time to think about how to save them for the next season. Unlike tulips or daffodils, gladiolus are not reliably hardy in most regions of the United States. If you want to enjoy them again, you will need to lift and store the corms before winter sets in. With a little care, storing gladiolus corms is simple and rewarding.

When to Lift Your Gladiolus

The best time for lifting summer bulbs is after the foliage has begun to yellow and die back. This usually happens following the first light frost. By this stage, the plant has already sent its energy back into the corm, which will sustain next year’s growth. Using a garden fork, gently loosen the soil around the plant and lift the clump, being careful not to damage the corms. Shake off any loose soil, and cut back the remaining foliage to a short stub.

Curing and Cleaning the Corms

Freshly dug corms are not ready for storage right away. They need to cure first, which allows them to dry and form a protective outer layer. Spread them in a single layer in a warm, dry, and airy location. Good spots include a garage shelf, a basement table, or even an unused spare room. Let them sit for two to three weeks until the outer husk feels firm and papery.

Once the curing process is finished, remove any withered remnants of the old corms that may still be attached. It is also wise to inspect each one closely. Discard any that are soft, moldy, or shriveled. Healthy corms should feel solid and show no signs of decay.

Storing Gladiolus Corms for Winter

Proper storage is the key to success. The ideal conditions are cool, dry, and dark. A temperature between 35 and 50 degrees Fahrenheit works well, so an unheated basement, root cellar, or even the vegetable drawer of your refrigerator can be a good option. Keep the corms in something that allows air to circulate, such as paper bags, mesh sacks, or cardboard boxes lined with newspaper. Avoid sealing them in plastic, as this traps moisture and encourages rot.

Check your stored corms once a month during the winter. If you notice any that have started to rot, remove them right away to keep the rest in good condition.

Overwintering Gladiolus in the Ground

Gardeners in warmer climates, particularly USDA zones 8 through 10, may be able to leave gladiolus in the soil through the winter. In these regions, a thick layer of mulch can provide enough protection. However, even in mild areas, lifting and storing corms is often recommended. It reduces the risk of disease, prevents overcrowding, and gives you a chance to sort and replant the healthiest bulbs in spring.

Why Save Gladiolus Corms?

Taking the time to cure and store gladiolus means you can enjoy the same beautiful varieties again without needing to buy new bulbs every year. You may also find small cormels attached to the main corms. These baby bulbs take a couple of years to mature into flowering size, but they are worth saving if you enjoy experimenting and multiplying your stock.

A Tradition Worth Keeping

For generations, gardeners have practiced overwintering gladiolus as a way to carry the joy of summer blooms into the next season. The process is not complicated, and it becomes second nature once you have done it once or twice. With just a bit of attention now, you can look forward to tall spikes of color brightening your garden again next year.