The larvae of a number of species of Lepidoptera feed on Norway maple foliage. Major invasive plant species include Japanese knotweed, Norway Maple, and Ailanthus. Of introduced tree species, sycamore maple is most abundant and Norway maple is common. Ectoedemia sericopeza, the Norway maple seedminer, is a moth of the family Nepticulidae. Oak trees predominate, with some Norway maple, wild pear and apple, and aspen. Norway maple seeds are flattened, while those of sugar maple are globose. Norway maple sits ambiguously between hard and soft maple with a Janka hardness of . Norway maple, red maple and sugar maple are the species most commonly affected. The introduced Norway maple for example occupies a prominent status in many of Canada's parks.