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10 Most Unwanted Plants Purple loosestrife Wanted for impersonation Disguised by beautiful purple flowers, this "purple plague" can easily overrun and conquer wetlands. The blossoms are purple. The leaves are green Canada thistle Cut-leaved teasel European buckthorn Garlic mustard Gray dogwood Multiflora rose Reed canary grass White sweet clover Wild parsnip drawing by Elizabeth Plonka