![]() ![]() Once seed sources are removed, seedlings may either be monitored every few years to remove saplings, or hand-pulled annually until the seed bank is depleted. Girdling, by removing the bark and phloem layer from 10 cm around the trunk is also suggested.įor small trees, try the “cut and cover” method to prevent stump sprouts: cut several inches above ground level and cover the stump with something that completely blocks light for 1-2 years. Monitor these gaps carefully and remove invasive species and/or plant native species to compete.ĭigging up or other manual removal is suitable for Norway Maple seedlings and saplings as long as the roots are completely removed, or adult trees felled close to ground level. 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. The Norway Maple is a tree that usually grows to 40-60 feet in height, but can reach heights of 100 feet. ![]()
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