The showy purple spikes of purple loosestrife are attractive in the garden and along roadsides, but the plant’s rampant spread has greatly reduced the ecological value of marshes by displacing native wetland vegetation such as cattails ( Typha spp.) that wildlife uses as food or shelter. One mature plant can produce over 2 million seeds a year that are easily transported by the wind or water into wetlands. The seeds easily germinate, and no natural predator holds this plant in check. Even cultivars reported to be sterile can produce highly fertile seed if grown with other cultivars or wild loosestrife.

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