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10 Most Unwanted Plants European buckthorn Wanted for stealing Known to steal space, sunlight and water from native plants and ecosystems. Leaves come out early and stay green long after the first frost. Beware of sharp, dangerous thorns. The berries are deep purple The leaves are green Canada thistle Cut-leaved teasel Garlic mustard Gray dogwood Multiflora rose Purple loosestrife Reed canary grass White sweet clover Wild parsnip drawing by Elizabeth Plonka