Mature trees can also be girdled in early summer by removing a four inch strip of bark and cambium from the whole circumference of the trunk. The incidence of regrowth also seems to depend on age, with mature trees regrowing less readily after felling than seedlings and saplings (Munger 2003). Although Norway maple can resprout from cut stumps, it seems to do so less aggressively than many invasive trees and shrubs. Physical control: Seedlings are easily hand-pulled from moist soil larger saplings can be dug or pulled using equipment. If control is undertaken when seed is present, it is best not to remove plant material from the site to avoid spreading seed. Whenever possible, plants should be controlled before they begin producing seed at around 10 years of age. Timing and spread concerns: Early detection is an advantage in managing any invasive species. For local assistance managing woody invasive species, please get in touch with a cooperative invasive species management group or a university extension program. For more detailed information on how to use these techniques, visit our Management and Control page. The following is a brief overview of management techniques shows to be effective on Norway maple. Green = native to part of the Great Lakes Basin It grows faster than red maple and has better branch structure than silver maple.ī The species is too large for most urban areas, but narrow cultivars may be suitable. ~ = trait is somewhat present but not as pronounced as in check-marked examplesĪ Freeman maple is a hybrid of two native maple species (silver and red). Alternatives for Norway Mapleīlack gum / Sour gum / Tupelo ( Nyssa sylvatica ) Please see our Landscape Alternatives pages for more information about how the WIGL Collaborative selected alternatives. The samaras of Norway maple are somewhat larger than those of native species, and the angle between the two halves is wider. Norway maple can be distinguished from sugar maple by the milky white sap that appears at the base of leaf stems when leaves are pulled from twigs. Look-alikes: Of the native maples, Norway maple is most similar in appearance to sugar maple ( A. Each wing of the samara is 1 ½ – 2” long, and the angle between them is wide, giving the samara a coat hanger shape. Fruits mature in early-to-mid fall and are the papery, winged two-chambered samaras characteristic of maples. Flowers emerging in early-to-mid spring are light green to yellow, each 1/3” across, and born in clusters. Leaves have five sharply pointed lobes, and are dark green to maroon in summer, sometimes changing to yellow or gold in fall (foliage color varies by cultivar). Its leaves are opposite each other, and are 4-7” in length and width. Identification: Norway maple is a large deciduous tree, often over 40’ tall at maturity and with a similarly broad crown.
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