In our scrub oak tree facts we included the most commonly asked questions about gambel oak in Colorado. How do you identify scrub oak? Scrub oak has rounded leaves with deep lobes and no bristle tip. The lobes can start about halfway up from the base. The sinuses are small and shallow and the bud scales tend to overlap each other. The leaves will also have a slender steam. Scrub oaks grow an acorn and not a fringe on an acorn cap. They grow best with low moisture and full access to the sun. How big will scrub oak grow? The trees stay more like shrubs than trees. With the right type of environment and gambel oak landscaping, it’s possible for