Have you mulched your beds lately?
A lot of people are under the impression that mulching should be done in the spring and fall...but thats just not true.
Anytime is a good time to mulch your beds. In fact, the heat of the summer is a GREAT time to mulch your beds if you haven't done it in a while.
Remember that mulch helps retain much needed moisture for your landscape...moisture that is lacking this time of year.
Mulch also provides a layer of insulation for your plants root system. The Texas heat puts a lot of stress on plants, and a thick layer of mulch is really the only way to remedy that.
A good 2-3" of mulch is what you need, so check your beds!