If you have ever seen a big field of red poppies or a bunch of black-eyed Susans growing by the roadside and decided you just had to have a garden full of the natural growing plants, there are some things to consider before you run out and buy packets of your favorites to sow. It is true, these plants do grow, reproduce, and expand on their own, requiring no help or maintenance from people. However, there are other considerations that you must take into mind.