Guelder Rose Viburnum Opulus L

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Weed of the Week Guelder Rose Viburnum opulus L. Common Names: Guelder rose; cranberrybush viburnum, American cranberry, European cranberry, cramp bark, snowball tree, red elder, rose elder Native Origin: It is native to the woodlands of the European deciduous forest, north Asia and north Africa. Description: A deciduous shrub in the honey-suckle family (Caprifoliaceae) growing to a height of 7-12 feet. The maple-like leaves are 3.5 inches" long, palmate lobed with edges coarsely serrated. Leaves turn bright red or rich purple before falling. The flower is snowy white with flat heads in 3 to 5 inches clusters. The flower is wheel shaped and the outer flowers have five petals and are sterile. The inner flowers are fertile and very small. The flowers develop red berries ½ inch in diameter. Bright red berries ripen in August attracting birds that spread the seeds. Some species are sterile and don't have berries. Habitat: It is found at the edges of woods, hedgerows and marshes. In the United States it is found in agricultural zones 3 to 8, which is a relatively cool climate. It grows in both heavy clay and acidic soil. Distribution: This species is reported from states shaded on Plants Database map. It is reported invasive in IN, PA, and WI. Ecological Impacts: It is an invasive shrub and will take over another plant's area and is able to spread out for more sunlight. Control and Management: • Manual- prune or sheer • Chemical- It can be effectively controlled using any of several readily available general use herbicides such as glyphosate. Follow label and state requirements. References: www.forestimages.org, http://plants.usda.gov, www.nps.gov/plants/alien, www.blueplanetbiomes.org/guelder_rose.htm Produced by the USDA Forest Service, Forest Health Staff, Newtown Square, PA. WOW 07-17-05 Invasive Plants website: http://www.na.fs.fed.us/fhp/invasive_plants .

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