![]() Biological invasion of the the Drew University (New Jersey) forest preserve by Norway maple (Acer patanoides L.). The Audubon Society Field Guide to North American Trees: Eastern Region. Ecophysiological attributes of the native Acer saccharum and the exotic Acer platanoides in urban oak forests in Pennsylvania, USA. ROUNDUP: Diluted with equal part water (1:1) oz./galĬut-stump treatments for established trees: Glyphosate or triclopyr can be painted on the cut surfaces to prevent re-sprouting.įoliar sprays for seedlings and young trees:įINALE : 3 fl. Larger trees can be girdled by cutting through the bark and phloem all the way around the trunk. Young seedlings are easily controlled with the herbicides below. Be sure that the cut goes well into the cambium layer. Using a hand axe, make a cut through the bark encircling the base of the tree, approximately 15 cm (6 in) above the ground. Girdling is useful on large trees where removal of large trees is not practical. Mature individuals in the vicinity of natural areas should also be removed to remove potential seed sources. The upright crown fills with greenish-yellow flowers in the spring. This tree is very shade tolerant, more so than all but a few deciduous trees in North America, but it can also tolerate. The habitat requirements of this species in North America are not well understood. Larger trees and saplings may be cut at ground level with power or manual saws. Watson2 INTRODUCTION This cultivar of Norway Maple has a height of about 50 to 60 feet, but only spreads to about 15 or 20 feet (Fig. In its native habitat, Norway maple is primarily found in lowland areas and low uplands, and also grows in mixed deciduous/coniferous forest. Large areas dominated by young seedlings can be easily controlled by mowing. ![]() Seedlings can easily be hand-pulled in their first year of growth. Seedlings and saplings are shade tolerant and can quickly dominate the forest understory. ![]() Also, the seeds of Norway maple are flatter than seeds of sugar or red maple. Norway maple can be distinguished from other maples by the milky sap exuded from the end of leafstalks when they are broken off. The popular “crimson” varieties have deep maroon leaves throughout the growing season. Its leaves typically remain green longer into the fall than other maples in Connecticut, and then turn yellow. It has a rounded crown of dense foliage, and gray or brown bark that becomes rough and furrowed into narrow ridges as the tree ages. Plant Patent PP4,944 issued November 16, 1982.Norway maple has been planted extensively as an ornamental tree and is now found invading natural areas where it often outcompetes native sugar and red maples and other deciduous trees. ‘Deborah’ was selected in 1967 as a seedling of A. Flowers give way to samaras (to 1 1/2” long) with horizontally spreading wings. Though small, the flowers have ornamental value. Yellow flowers appear in clusters before the foliage in spring. Leaves display a wrinkled appearance with crinkled and undulating margins. ‘Deborah’ is a cultivar with an oval-rounded habit that is noted for its bright red emerging leaves that change over a 4-6 week period to deep maroon and finally dark green. Specific epithet means resembling platanus (sycamore), which is somewhat curious since the leaves of Norway maple do not really bear that much resemblance to sycamores. Genus name is the Latin name for a maple tree. Flowers give way to paired seeds with horizontally spreading wings (samaras to 2” long). Small yellow flowers in erect clusters (corymbs) appear in spring before the foliage. Fall color is usually an unremarkable yellow. Leaves (to 7” across) have five sharply pointed lobes and resemble those of sugar maple. It is a medium-sized deciduous shade tree typically growing 40-50’ tall with a dense, symmetrical, rounded crown. It has been widely planted in urban areas throughout much of the U.S. ![]() Acer platanoides, commonly called Norway maple, is native to Europe.
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