Trees are a forever part of a good landscape. They need food and water to grow. Remember, during the hot part of summer they go dormant, so if you want to encourage growth take care of them like they are the family pet. a deep soaking every 7 - 10 days is what they need to become a focal point in the landscape. Be sure to give them space and think about big they will become long after you are gone. This link to the Texas Big Tree Registry will give you something to aim for.