Will gladiolus come back each year?

yes and they multiply|||most likely|||If you live where the summers are cool enough, they will. In the US sub-tropical zones, 8 and 9, the bulbs will just rot away in the heat and humidity.|||If you are in a cold zone, say 5 or colder, there is also the chance that they will freeze out and not come back. This seems to depend on the cultivar and also if the bulbs are deep enough to be below the frost line.|||Yes they will