Plant gladiolus bulbs in the spring once danger of frost has passed and the soil has warmed. Then Space the corms 3 to 6 inches apart. Water the corms thoroughly
Gladioli like well-drained, light soil and full sun. Also I used to cane mine before I covered up the corms - Just to ensure I did not put the cane through them by accident.

I'd move them when the leaves are dying back - ie when you can still see where they are but leaving time for the leaves to feed up the bulbs for next year. And you could try giving them a high potash feed before that happens if there's still time.