The seeds can remain viable even after 20 months of submergence in water. Seeds may be dispersed by water, wind and in mud attached to animals. Purple loosestrife also spreads vegetatively. Root or stem segments can form new flowering stems. Muskrat cuttings and mechanical clipping can also contribute to rapid spread by floating in riverine and lacustrine systems.
Purple loosestrife lacks natural enemies in the United States.
Once established, it can destroy marshes and wet prairies and choke waterways. As such, the sale in Missouri of purple loosestrife or any of its hybrids is prohibited. It is also unlawful to distribute or plant seeds, plants or plant parts in the state. Control Recommendations Current mechanical and chemical control methods have only limited success. Smaller infestations are more likely to be controllable, therefore early diagnosis is critical.