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The Pennsylvania Department of Agriculture has added ravenna grass, glossy buckthorn and common buckthorn to a list of noxious weeds — plants that cannot be legally sold or cultivated in the state. The non-native plants spread aggressively into wooded areas and fields, crowding out beneficial plants and disrupting native ecosystems. The ban on sale and cultivation will take effect April 5, 2022 with enforcement phased in over the next year.