A couple of good links

I think I've posted the invasives one before, but here it is again.

http://www.texasinvasives.org/plant_database/index.php

Here's an interesting one about expansive soils, which ends up showing how you could do a swimming pool in such a place (yes, it's complicated!).

http://web.mst.edu/~rogersda/expansive_soils/DAMAGE%20TO%20FOUNDATIONS%20FROM%20EXPANSIVE%20SOILS.pdf