Gladiolus can come back year after year. However, there are a few factors to consider, such as the climate and hardiness zone in which you live. Gladiolus corms are not winter hardy, which means that in colder regions with zones 3-7, they need to be dug up in the fall and stored indoors over winter to protect them from freezing temperatures.
Living in zone 8-10 provides a more favorable environment for gladiolus, as these corms can be left in the ground over winter without the need for digging them up. In these warmer regions, the gladiolus corms will naturally go through their dormant period during the winter months and then begin growing and blooming again in the following year.
For those of us in colder regions, it may initially seem like a hassle to dig up and store the gladiolus corms every year. However, with a little bit of planning and preparation, it can become a routine part of our gardening practices.
To dig up gladiolus corms in the fall, start by cutting back the foliage once it has turned yellow or brown. This signals that the plant has finished its growing season and is preparing for dormancy. Use a garden fork or shovel to carefully lift the corms out of the ground, being careful not to damage them. Shake off any excess soil and trim off any remaining foliage, leaving about an inch of stem attached to the corm.
Once the corms have been dug up, it’s important to store them properly to ensure their survival over winter. Start by allowing them to dry out for a few days in a well-ventilated area. This helps to prevent rot and fungal diseases. After they have dried, remove any loose soil and inspect them for any signs of damage or disease. Discard any corms that appear soft, shriveled, or moldy.
Next, choose a suitable storage location for the corms. An ideal option is to store them in a paper bag or mesh bag, as this allows for good air circulation. Avoid using plastic bags, as they can create a humid environment that promotes rot. Place the corms in the bag, making sure they are not touching each other, and store them in a cool, dry place with a consistent temperature between 35-45°F (1-7°C).
Throughout the winter, it’s a good idea to periodically check on the corms to make sure they are still in good condition. If any corms show signs of rot or disease, remove them immediately to prevent the spread to the others.
In early spring, usually around the time when the danger of frost has passed, it’s time to start preparing for planting the gladiolus corms again. Remove them from storage and inspect them once more for any signs of damage or disease. If they appear healthy, they are ready to be planted back into the ground.
Before planting, it’s important to prepare the soil by loosening it and adding organic matter, such as compost, to improve its fertility and drainage. Plant the corms about 4-6 inches deep, spacing them about 6-8 inches apart. Water them thoroughly after planting and continue to water regularly throughout the growing season.
With proper care and attention, gladiolus corms can continue to come back year after year, providing beautiful blooms in your garden. The effort of digging them up and storing them over winter is well worth the reward of seeing these vibrant flowers grace your garden year after year.
