Gladiolus, also known as glads, are a beautiful flowering plant that can indeed come back year after year. However, whether or not they return depends on the climate zone in which they are grown.
In zones 3-7, where winters can be quite cold, gladiolus corms need to be dug up in the fall and stored indoors over winter. This is because they are not winter hardy and cannot survive the freezing temperatures. To ensure their survival, it is important to dig up the corms before the first frost hits.
To dig up gladiolus corms, start by cutting back the foliage to about 2 inches above the ground. This helps the plant redirect energy to the corm for storage. Then, carefully dig around the corm, being cautious not to damage it. Gently lift the corm out of the ground, shaking off any excess soil.
Once the corms are out of the ground, they should be dried and cured before storing them for the winter. Lay them out in a cool, dry area for a couple of weeks until the corms are completely dry. This helps prevent rot during storage. After drying, remove any loose soil and cut off any remaining foliage.
Storage for gladiolus corms is best done in a cool, dark, and dry location. Some gardeners prefer to store them in paper bags or mesh bags to allow for air circulation. Others use containers with peat moss or vermiculite as a storage medium. Regardless of the method, it is important to check on the corms periodically during the winter to ensure they are not rotting or drying out.
In zones 8-10, where winters are milder, gladiolus corms can be left in the ground over winter. With proper care, they will grow and bloom again the following year. This can be a time-saving benefit for gardeners in these warmer climates, as they do not have to go through the process of digging up and storing the corms.
However, even in zones 8-10, it is still important to provide some protection for the gladiolus plants during the winter months. Adding a layer of mulch around the base of the plants can help insulate the corms and protect them from freezing temperatures. Mulching also helps retain moisture in the soil, which is beneficial for the plants during their dormant period.
When spring arrives, and the danger of frost has passed, gladiolus plants will begin to sprout new growth. At this time, it is important to remove any mulch that was placed around the plants. This allows for proper air circulation and prevents the mulch from becoming a breeding ground for pests or diseases.
Gladiolus can come back year after year, but the method of overwintering differs depending on the climate zone. In zones 3-7, the corms need to be dug up and stored indoors, while in zones 8-10, they can be left in the ground with some protection. By following these guidelines, gardeners can enjoy the beauty of gladiolus blooms year after year.
