I took out my coleus last fall and they are back now end of July. I did not replant .???
They are beautiful and hearty where did they come from?
Certified GKH Gardening Expert
They reproduce by seed, and sometimes by roots left behind.
This article will give you more information on preventing plants that reseed: https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/managing-self-seeders.htm