Most plants can be "cloned" by snipping off a cutting, putting it in
water and letting roots develop (among other ways).  This is sometimes
called propogation.  In either case, the new plant created is a
genetic copy of the previous one.  But my two part question is a step
removed.  How many Americans (percentage) know you can clone plants,
or have cloned plants (even if they don't know it is cloning)?

This seems like it would be impossible to answer. -shiva777