Introduced from Europe as an ornamental, Norway Maple has been much planted as a lawn or street tree and has now become widely established and invasive over much of the Northeast, including Maryland. Many ornamental varieties have been developed and planted.
A handy trick to differentiate Norway Maple from other maple species is to remove a leaf by the base of its stem and look for white sap, at least early in the growing season. Norway Maple can often be distinguished from other maples because its leaves are wider than long, whereas other maples have leaves that are mostly longer than wide. The flowers are bright yellow-green and are borne in erect clusters in early spring, before the trees leaf out. The fruits (samaras) of Norway Maple are large (1-3/4 inches) and widely spreading. They ripen in summer, but fruit and fruit stalks often persist into winter (Sibley, 2009). The leaves typically turn yellow in fall.
Host to Norway Maple Seedminer (also non-native).
There are 209 records in the project database.
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