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Is now a Class B noxious weed in WA and OR State. The largest problem in WA is found on the west side of the state (west of the Cascade Mnts.) One study found that in one single flower head an estimated 40,000 seeds can be produced. Also noted that cut stems on the ground are capable of producing basal roots and rooting them selves to start new plants.
Source: Washington State Noxious Weed Control Board