Try posting this question over on the main "Roses Forum". In that post, also note if you want to grow plants that are disease resistant and do not require treatment with a fungicide. There are a few folks from Texas who can give you great info on what they grow (a lot) and how to grow them.

Here is a link that might be useful: Roses Forum

& you can post on the Texas Forum, too.

Best luck!

you will find a wealth of info at Antique Rose Emporium website, and they are in Texas. have been very happy and learned alot on that site. Also why don't you do a search on Earthkind roses? Those are easy to grow, disease resistant, earth friendly. Interesting how folks can participate in their trials.
I believe their is another old garden rose mail order dealer in Texas. Just do a google search for antique roses or old garden roses and you'll find alot. Those are the roses I think that would do very well in Texas and throughout the south. Main difference between Texas and Florida, I think, is less humidity in Texas, and likely less rainfall (unless coastal Texas). Depending on where in Texas, winters will definitely be colder.