Answer: There's a whole list of plants which were originally planted in gardens but have escaped cultivation and are now considered invasive weeds. Some of these plants are restricted in certain localities and cannot be grown in gardens because of their potential to escape and replace native plants. This puts you in the position of having to be very selective when planting your weed garden.
For a complete list, contact Pacific Northwest Exotic Pest Plant Council, 4409 SW Obsidion, Redmond, OR 97754.
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