Here's my page of links to useful landscape information and other random stuff.
Texas A&M Agrilife Extension Service's Webpage is the most comprehensive resource for Texas gardeners. It has a truly amazing amount of information; so great it can be overwhelming. Use the search tool. I plan to add additional direct links.
Native Plant Database at the Laydbird Johnson Wildflower is a great place to read detailed information on native plants. Look up plants by scientific or common name, or by various criteria such as deer-resistance or butterfly attraction. Mr. Smarty Plants has probably answered your exact question before.