This exotic invader from Eurasia was introduced as an ornamental and is on the state quarantine list. Loosestrife flowers July through September with purple-magenta color blossoms. Its flowers are numerous on a long spike, five to six petals per flower. The woody taproot with a fibrous root system forms a dense mat. Loosestrife's appearance is similar to fireweed and spirea.
Purple loosestrife grows in wetlands and along fresh water lakes, streams, rivers and creeks.
It clogs drainage ditches and irrigation canals. Waterfowl and wildlife populations are decreased as loosestrife invades. The shrub spiraea is often mistaken for purple loosestrife. Note the differences in leaves and flower heads. Also, please read about the history, method of spread, method of control, and identification of Purple Loosestrife on our aquatic weeds page .