REFLECTIONS

I found this plant in one of my flowerpots last year.  It looked too good to discard so I left it in the pot.  It survived the winter and I want to see what it will grow into. I carefully dug it up and found this very long root.  It's more than twice the length of the plant! I found another identical plant while I was working.  It's root was much shorter. It's the plant to the left. I hope they live and maybe even grow into trees.  But they could only be weeds. Does anyone know what they might be?  I could not find it on Google.