The Armstrong maple (Acer rubrum 'Armstrong') is a deciduous tree that is commonly used as a shade tree and as an ornamental tree in landscapes. It is a cultivar of the red maple and can grow up to 40 to 60 feet (12 to 18 meters) tall and 15 to 25 feet (4.5 to 7.5 meters) wide.
The tree has a narrowly upright, columnar shape with a single, dominant leader and strong, upright branches that are resistant to storm damage. The leaves are medium to dark green in the summer, turning bright red or orange in the fall before dropping. The Armstrong maple produces small, red flowers in early spring that are not showy. The tree's bark is gray and smooth when young, but becomes darker and more furrowed as it ages.
It's important to note that the size of the tree can be influenced by various factors such as soil conditions, climate, and pruning practices. So, the actual height and spread of the Armstrong maple may vary depending on the specific conditions in which it is grown.