Jen: I think you are referring to Amur corktree, Phellodendron amurense ... by the description of its ability to grow in concrete I would say it could be an urban problem. Chinese tree of heaven, Ailanthus altissima is a very destructive invasive hardwood tree that is rapidly colonizing unmeasured thousands of acres in the mid-Atlantic and Appalachian regions of the Eastern US. Allelopathy, or the ability to poison the growing environment to the detriment of your native competitors is one of the features of some of the most destructive invasive plants. Garlic mustard has such profound allelopathic properties that it is poised to become the poster plant for site conversion. I would encourage you to add the following website to your favorites: _http://www.nps.gov/plants/alien/_ (http://www.nps.gov/plants/alien/) The information on forest health and invasive plants is current and useful. Russ Richardson **************Need a job? Find employment help in your area. (http://yellowpages.aol.com/search?query=employment_agencies&ncid=emlcntusyelp00000005)
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