Purple loosestrife (Lythrum salicaria) LITH-rum sal-ih-KARE-ee-ah Genus:  Lythrum 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. Noteworthy Characteristics:  Showy purple flower spikes. Highly invasive in all regions. Care:  Grows in any moist soil in full sun. Propagation:  Self-sows with abandon. Problems:  Slugs, snails, Japanese beetles.

Overview

Height 3 ft. to 6 ft. Spread 1 ft. to 3 ft. Growth Habit Clumps Growth Pace Invasive/Aggressive Grower Light Full Sun Only Moisture Medium to Wet Maintenance Moderate Characteristics Showy Flowers Bloom Time Fall, Summer Flower Color Pink, Purple Uses Beds and Borders Seasonal Interest Summer Interest Type Perennials