Gladiolus flowers, also known as gladioli or glads, have the ability to come back year after year. However, their ability to survive the winter and bloom again depends on the climate and hardiness zone where they are grown.
In regions with colder climates, specifically zones 3-7, gladiolus corms need to be dug up in the fall before the first frost. This is because they are not winter hardy and cannot withstand the freezing temperatures of winter. The process of digging up gladiolus corms involves carefully lifting them from the ground using a garden fork or shovel, being cautious not to damage the corms or their attached cormels (smaller corms).
Once the corms are lifted, it is essential to remove any excess soil and allow them to dry for a few days in a well-ventilated area. This drying period helps prevent rot and fungal diseases during storage. After drying, the foliage can be trimmed down to a couple of inches above the corm, and any dead or damaged cormels can be removed.
To store the gladiolus corms over winter, they should be placed in a cool and dry location such as a basement, garage, or cellar. It is important to keep them in a well-ventilated area to prevent moisture buildup, which can lead to rot. Some gardeners store the corms in paper bags or mesh bags to allow for air circulation.
During the winter storage period, it is a good idea to periodically check on the corms to ensure they are not drying out too much or becoming too moist. If necessary, you can lightly mist them with water or adjust the storage conditions accordingly.
In spring, once the danger of frost has passed, the gladiolus corms can be planted back into the garden. It is recommended to enrich the soil with compost or well-rotted manure before planting to provide nutrients for the new growth. The corms should be planted at a depth of about 4-6 inches and spaced approximately 6-8 inches apart.
On the other hand, in milder climates such as zones 8-10, gladiolus corms can be left in the ground over winter without the need for digging them up. These regions typically have mild winters that do not reach freezing temperatures, allowing the corms to survive and grow again the following year. However, it is still important to provide adequate care and maintenance throughout the year to ensure healthy growth and blooming.
Gladiolus flowers can come back every year, but the approach to their winter care differs depending on the hardiness zone. Gardeners in colder zones need to dig up and store the corms, while those in milder zones can leave them in the ground. By understanding the specific needs of gladiolus and providing appropriate care, gardeners can enjoy their vibrant blooms year after year.
