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10 Most Unwanted Plants Canada thistle Wanted for illegal entry An escapee from across the border, this infiltrator will swipe land from native species. Hard to eliminate. The blossoms are lavender. The leaves are green Cut-leaved teasel European buckthorn Garlic mustard Gray dogwood Multiflora rose Purple loosestrife Reed canary grass White sweet clover Wild parsnip drawing by Elizabeth Plonka