Texas Gardening: Please identify this plant, 1 by sublimaze1

sublimaze1 wrote:
Here's the deal: The company - subcontracted by the builder - who originally landscaped my back yard (three years ago) has since gone defunct. Can't find them. Actually, don't want to. Now, this plant has been there from the get-go, but this season it has truly produced some amazing foliage and flowers. I am clueless as to what it is, but am interested in its genus. Also, would like to know its voracity, because if it is weed-like, I may desire to crop it back, or even get rid of it. Thanks in advance - W Jones (william.jones@usa.net)