Crimson King maple (Acer platanoides 'Crimson King') 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 Norway maple and can grow up to 40 to 50 feet (12 to 15 meters) tall and 30 to 40 feet (9 to 12 meters) wide.
The tree has a dense, rounded canopy and produces small, yellow-green flowers in early spring that are not showy. Its foliage is a deep reddish-purple color throughout the growing season, which is where it gets its name. The Crimson King maple has a smooth gray bark when young, which eventually develops some furrows and fissures as the tree matures.
Crimson King maple is known for its striking foliage color and overall aesthetic appeal. It is also relatively tolerant of urban conditions, such as air pollution and compacted soil.