These seeds are readily dispersed by water and have the potential to remain viable for several years. Also, this plant can spread vegetatively by resprouting from cut stems and regenerating from pieces of root stock. Most control methods have a detrimental effect on other plants and result in disturbances that favor reinvasion by purple loosestrife or other exotic species. Once established, purple loosestrife displaces native vegetation. In addition, it is important to note that plants of similar appearance are present in the area and should not be subjected to control.
Proper identification is important.
Prior to applying control, natural area managers must determine their objectives. It may be more feasible to contain a population of purple loosestrife than control it. Large populations extending over one hectare or more will be difficult to completely eradicate. It may be more feasible to contain large populations at their present position. This can be accomplished through hand-pulling new plants along the periphery or applying herbicides on plants extending beyond the main population.