![]() A weed wrench pulls Norway maples out of the ground with most of their roots intact. If the only new trees are seedlings and saplings, Norway maple control can be affected by weeding these out by hand. ![]() Controlling Norway maple populations is a real challenge. How to Manage a Norway MapleĮxperts addressing the question of how to manage a Norway maple recommend against planting the tree in new developments. Though not native to this country, Norway maple trees are currently found in half the states, and they are considered invasive in most of them. Given the vast numbers of seeds produced by the tree and the ease with which they grow, Norway maple weed trees in your backyard spread quickly to nearby forests and fields. These maples are called “Norway maple weed trees” because they spread so rapidly. This makes controlling Norway maple difficult. They germinate promptly, even in full shade. These samaras are packed with seeds, and the wind blows them far and wide, allowing the seeds to spread. The flowers give way to winged fruit called samaras. The trees produce upright clusters of yellowish green flowers that bloom in May. Both the leaves and the twigs “bleed” a milky sap when cut or broken. The color and texture of the bark contrasts with the dark green, deeply lobed leaves that grow to 6 inches (15 cm.) long and 5 inches (13 cm.) wide. The trunk of the Norway maple is mottled gray and smooth. They have dense, rounded canopies that offer deep shade beneath. Norway maples are tall, attractive trees that taller than 65 feet (20 m.). For information about Norway maple control, read on. Controlling Norway maples is much more difficult than growing them. In the wild, Norway maple shades out native plants. However, they produce many seeds and propagate so easily that they readily escape cultivation. Still have a question? Contact us at Ask Extension.Norway maple trees ( Acer platinoides) are wonderful shade trees in the garden. 168pp.Ĭompiled by Christa Carignan, reviewed by Debra Ricigliano, University of Maryland Extension, 10/2018. Plant Invaders of Mid-Atlantic Natural Areas, 4th ed. Mistaken Identity? Invasive Plants and Their Native Look-alikes. Sarver, Matthew, Amanda Treher, Lenny Wilson, Robert Naczi, Faith B. Invasive Plants: Guide to Identification and the Impacts and Control of Common North American Species. Kaufman, Sylvan Ramsey & Wallace Kaufman. Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses, Sixth Edition. (PDF) Control of Invasive Non-native Plantsĭirr, Michael A. Red maple (Acer rubrum) Controlling Norway Maple Seedlings establish quickly in deciduous forests. Tolerates a wide variety of light and soil conditions. Photo: Jan Samanek, Phytosanitary Administration, Photo: Leslie Mehrhoff, University of Connecticut, Conditions that favor growth Spreads to new areas by seeds and vegetative reproduction. Seeds mature in September-October and often remain on the tree into winter. The “wings” of the samara spread widely to nearly 180 degrees. Large quantities of paired winged seeds (samaras) are produced. White sap exudes from stem Photo: Lesli Mehrhoff, University of Connecticut, Reproduction Norway maples can be distinguished from other maples by a white milky sap that exudes when a leaf petiole (stem) is detached from the tree. Mature bark is gray-brown with shallow, interlacing ridges and furrows. Greenish-yellow flowers in clusters are produced in April-May. The leaves are opposite of each other along the stem. Norway maples produce dark green, deciduous leaves with 5-7 sharply pointed lobes. The dense root system alters nutrient availability and impedes the growth of other species, resulting in lower plant diversity. The dense shade of these trees reduces light availability for forest understory plants. In some communities, it was planted heavily when American elms were lost to Dutch Elm Disease. It was used as a street tree due to its fast-growing nature and tolerance of poor soils and air pollution. Native to Eurasia, it was introduced to the United States in the 1750’s. Norway maple (Acer platanoides) is a broadleaf deciduous tree that grows up to 50+ feet in height and produces copious amounts of seeds and dense shade. ![]() About Norway maple (Acer platanoides) Life cycle and background
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