Unique Features: The Norway maple was introduced here in the 1700’s and adapted well enough to become invasive in the eastern U.S.  So far that’s not a problem in Colorado. They grow at a moderate rate, have strong wood, and the deep green leaves are large and cast a dense shade. They do have shallow roots that can lift sidewalks, and they can be picky about water. The Deborah grows moderately into a large, rounded tree. In spring the leaves emerge red and quickly deepen to a maroon, and then dark green for the growing season. They finish in fall with a vibrant bronze-yellow. The Norway maples are less affected by soil pH than other maples, but are somewhat intolerant of poorly drained soils. It is recommended to elevate the top of the root ball above grade level by several inches. Maples ‘wake up’ as early as February, and necessitate an increase in the winter watering at this point.