I took out my coleus last fall and they are back now end of July. I did not replant .???

Question

They are beautiful and hearty where did they come from?

Answer 1

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