Due to a combination of reasons, it is advisable to select landscape trees that require zero care. Here is a list of trees that will be able to survive without watering and can tolerate excessive drought: 1. Texas Persimmon 2. Gum Bumelia 3. Prickly Ash 4. White Shin Oak 5. Western Soapberry 6. Mesquite 7. Prairie Flameleaf Sumac 8. Texas Live Oak 9. Texas Ash 10. Netleaf Hackberry 11. Ashe Juniper 12. Cedar Elm 13. Osage Orange 14. Arizona Walnut 15. Pecan