A native to Europe, the Norway maple is a medium to large size tree. It can reach heights of up to 100 feet, but is commonly seen at 40 to 60 feet, with a trunk diameter of 1 to 2 feet.
Hardiness: Maples vary in hardiness. Most fall into zones 4 through 8, but some are less tolerant of cold or heat than others. When selecting a maple tree, be sure to select a species suited for Iowa's winter.
Growth Rate: Maples vary in growth rate. Maples that are fast growing tend to have weak wood and may suffer from wind and ice damage. Slower growing maples have heavier, harder wood, making them less susceptible to branch and limb drop.
Mature Shape: Maples typically have a large, rounded crown. Tree canopies may be very dense or wide spreading.
Height: Mature height varies with species.
Width: Width varies with species.
Site Requirements: Maple trees perform best in moist, well-drained soils. Site requirements vary with the species of maple.
Flowering Dates: April - June
Seed Dispersal Dates: October - November
Seed Bearing Frequency: Each year
Seed Stratification: Prechill 2 months at 34°F to 40°F
The leaves are 5 to 7-lobed with irregular serrated margins, measuring 4 to 7 inches in both length and width, petioles are 3 to 4 inches in length. The leaves are very similar to sugar maple. However, Norway maple has one definitive characteristic; a milky sap is present when a petiole is broken. Additionally, the leaves are a darker green, turning pale yellow in autumn. The Norway maple will also hold its foliage for two weeks longer than native North American maples in autumn. The fruit is a samara; two papery wings, each about 2 inches long, and maturing in the early autumn. The Norway maple has been planted throughout North America as an urban ornamental shade tree due to its high tolerance to urban pollution.