![]() Light gaps left by cut or girdled canopy trees may result in rapid growth of Norway maple seedlings or colonization by other invasive species. Kill any sprouts at the end of the growing season, and annually thereafter. Avoid soil disturbance, which promotes seed germination. Prevent saplings from growing to maturity. Prevent or limit seed production by targeting mature trees. Norway Maple seeds are contained in winged samaras that are dispersed by wind. Thus, it can reduce native species diversity and change the structure of forest habitats. This tree is able to shade out native understory vegetation such as spring ephemerals, and eventually outcompetes native tree species in the forest canopy. Multiple sources of seed from Europe were available shortly after this initial introduction. Bartram later offered it for sale in his garden catalogue in 1762. The first documented introduction of Acer platanoides to the northeast was by John Bartram of Philadelphia, in 1756. It has naturalized to nearby woods such as urban woodlots, forest edges and fragmented forests, and from there has moved on to less disturbed habitats. The Norway Maple has a wide distribution throughout New England, in part due to its extensive planting as a street and ornamental tree. The samara wings are divergent, reaching nearly 180 degree angle to each other. The fruit are samaras that are green when young and turn yellow, then brown, with age. The pendulous fruit measure 1.5-2 inches in length. They are borne in erect, pedunculate, rounded corymbs. The flowers appear in April and May and are yellow-green in color. The fall color of the green leaves is yellow. ![]() The leaves are usually green in color, but there are some cultivars that have dark red leaves. The leaf petioles exude a white sap when broken. The palmately lobed leaves are opposite and have 5 to 7 sharply acuminate lobes (with large but few teeth). The bark of the tree is grayish and regularly and shallowly grooved. ![]() Her fruit skin is bald on the inside.The Norway Maple is a tree that usually grows to 40-60 feet in height, but can reach heights of 100 feet. The nutlets are equipped with fruit wings. They hang in pairs and form an obtuse angle - because of their cleavage during the ripening period they are also called split fruits. The maple tree, like the sycamore, produces nut fruits. The pollination of the flowers is done by insects. The flowers contain a lot of nectar - the flowering period is in the months of March to the end of May. The color of the flowers ranges from yellow to green. The flowers are already visible long before the foliage emergence, they are unisexual and zwittrig - both forms are arranged in an upright, umbelliferous panicle. The young Norway maple has a smooth, light brown bark, which gets its characteristic furrows only in old age. The bark of the maple is traversed by small, elongated grooves and has the property not to peel off. The bark of the maple tree is characterized by prominent furrows, the bark can show a light gray to greenish-gray color. At the end bud, the incompletely formed uppermost lateral bud pair is visible. The lateral buds remain smaller and are close to the shoot. The full-grown, egg-shaped buds are up to nine inches long and five to seven inches wide. The budding buds are bare and shimmer reddish-brown. During autumn, the leaves of the maple turn golden-yellow to an intense red. The leaf margins are pointed, as the name suggests. It is divided into five to seven different sized lobes. A maple leaf is recognizable by its shape reminiscent of a hand. The leaf top has a dark green, glossy color, the interior of the petiole contains a milky liquid. It stalk can grow up to 20 centimeters long (8 inch). The leaves of the maple are arranged opposite, as in the sycamore maple. The stem thickness of a maple tree ranges from 60 to 100 centimeters (23 to 40 inch). In old age, the maple has formed a nearly round crown, its branches do not grow overhanging and do not become excessively long. As a young tree, the maple is fast-growing. Its branches grow diagonally upwards, sometimes horizontally. ![]() On the slender trunk sits a pronounced, dense treetop. Norway maple can grow up to 30 meters (99 ft) tall.
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