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Glossy buckthorns grow into dense thickets, displacing native under-story plants, shading tree seedlings, and lead to decreased insect diversity. Western New York Partnership for Regional Invasive Species Management.
Buckthorn species are very aggressive and produce dense thickets that shade out native species. St. Lawrence-Eastern Lake Ontario Partnership for Regional Invasive Species Management.
Severe infestations of buckthorns may limit the regeneration of native tree seedlings. Adirondack Park Invasive Plant Program.