Shrubs and trees require help their first year and Nellie R Stevens hollies are no different.
They do not require any heroics but do not let them dry out because just one time of extreme dryness can lead to terminal wilt for the plant. Once established, the Nellie R Stevens holly can deal with the demands Parker County weather makes on them. It is a quality plant and should be considered for Parker County landscapes. In time of limited rainfall, you will need to supplement with water to help the plants in your landscape.