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Purple loosestrife Lythrum salicaria Minnesota C-Value: 0 Wetland Indicator Status: OBL Non-native Invasive Smooth margin Leaves: Opposite or in whorls of 3. Sometimes clasping, usually hairy, lanceolate, margins entire. 3-5 times longer than wide. Stems: Square stems, hairy or smooth, can be ‘woody’; 4-6 ft tall. Old stems remain over winter. Flowers and fruit: 6-petaled purple-red flowers on spikes 3-12 in. long. Flowers often wrinkled; many flowers in flower head. Plant communities: Shallow marshes, wet meadows, lakeshores, streamsides. Comments: Perennial. Prohibited noxious weed in Minnesota. Has the capacity to out-compete most marsh vegetation. Highly prolific seed producer, so management is encouraged before flowers go to seed. Bio-controls available. The native, less robust loosestrife ( L. alatum) has fewer, lighter colored flowers in the flower head. 2008
