I had free petunia plants last year in the pots the previous years petunias grew. No, these were not the same plants as they are annuals that got pulled in the fall. Never thought about them seeding themselves like that. Maybe that $53 plant can do the same thing so you get a second year out of it essentially halving the cost???
Isn't that the very definition of propagating the line which is protected via patent? I too doubt these would grow from a seed, but at least growing a plant from a seed is not patentable regardless of what Monsanto thinks.
It's really only enforceable if you attempt to make money from it or even just distribute it as your own to the point they find out about you. If you do anything to share the new plants that prevents them from making money, you'll be "guilty". If you do it just to fill in your backyard, they'll never find out about you.
We love us some volunteers