you shuold see the guppy grass that i cleared out last week
its odd alot of the water wprite has roots growing off of the stems its like a tree i know of a hybrid poplar they do that you just cut off a branch and stick it in the ground and next thing you know you have a new tree they grow over 1' a year sorry al that is of subject
That's basically what the water sprite is doing, I've seen almost all of my aquarium plants do it. Anywhere you see aerial(wrong word for this, I guess, but I can't think of the right one) roots, you can cut the stem below that and plant the roots in the substrate and off it goes as a new plant.