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buckthorn what is the problem, Common Buckthorn European Buckthorn Rhamnus catharticus invades woodlands, savannahs,prairies, abandoned field, roadsides, What's the Problem with buckthorn? alternate hosts for soybean aphid, What's the Problem with buckthorn? very invasive in our clime because cold tolerance- extended growing season, What's the Problem with buckthorn? hard to control because resprouts when cut, What's the Problem with buckthorn? hard to control because grows rapidly, What's the Problem with buckthorn? displaces woody seedlings, native understory provides wildlife habitat, can tolerate diverse habitats such as sun - shade, can tolerate diverse habitats such as wet-dry, What's the Problem with buckthorn? alternate hosts for oat rust fungus