Like many perennial plants, gladiolus grows from a large bulb each year, then dies back and regrows the following year. This “bulb” is known as a corm, and the plant grows a new one right on top of the old one each year.

Do gladioli bulbs spread?

do gladiolus spread? Gladioli is a clump-forming tender perennial and if protected from the winter frosts will return year after year. If clumps get congested, lift and divide.

Do you have to dig up gladiolus bulbs every year?

Gladiolus bulbs, or corms, aren't hardy through frozen winter months, so you must dig them up and store them until spring if you want to grow them again the next year.