If you're looking for plants that practically raise themselves, look no further than Texas Superstars. The Texas Agri-Life folks give the designation to plants that pass rigorous field testing. The plants are disease-resistant, drought-tolerant, and need no chemical pesticides.
You can find the plants at most area nurseries. Interestingly, Lowe's has brokered a deal with the Aggies to donate a portion of sales of Superstars to go toward continuing research. While I'm not promoting Lowe's, I think it's a great PR move. Maybe other nurseries will follow.
For a list of Superstar plants, like this Texas Gold columbine - visit http://www.texassuperstar.com.