Here is a piece of information that should make you happy : if you enjoy lily of the valley and look forward to spring each year to have some in your home, you should know that yes, you can replant your lily of the valley, under certain conditions.
When choosing your lily of the valley, make sure you take sprigs that have been picked with their roots or buy lily of the valley in a pot. Indeed, the presence of rhizomes will allow you to replant these flowers efficiently in a window box or directly in your garden.
If you decide to plant your lily of the valley on the ground, remember that its roots spread quickly. Like bamboo, lily of the valley has very active rhizomes that like to take up space. Therefore, you should choose a place where it can grow without running into other plants.
The end of summer is the best time to plant. Once you have done this, keep an eye on it, as it must not run out of water. Your lily of the valley plant will then last through the winter and flower again in the spring. This perennial plant will bloom every year with the arrival of warmer days, to perfume its surroundings and delight bypassers.