Competencies are Key by Trees Are Key published on 2019-05-30T14:04:20Z Trees Are Key Are you competent? For our urban and community forestry program we use competencies to help drive our program and professional development. We have a list of U&CF competencies and each of our program development meetings concentrates on one or more of these competencies to improve our program. Listen in to learn more! Species Spotlight Chinkapin Oak Quercus muehlenbergii is a deciduous Texas native medium or large tree reaching a height of 70 feet and a trunk to 3 feet in diameter, with a rounded crown of glossy, green foliage. It is also planted widely as a shade tree suitable for limestone soils.