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Download Purple Loosestrife (Lythrum salicaria)
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Purple Loosestrife (Lythrum salicaria) PL LYTH SAL Perennial species that o#en forms solid stands in aqua"c to semi-aqua"c sites. One plant can produce many stout, 1 to 3 metres tall, branched stems. Introduced as an ornamental from Europe in the early 1800’s. Distribuon Not currently found in the Thompson-Nicola Regional District. Please report all occurrences. Interes!ng Facts: Invades wetland areas and can expand quickly due to abundant seed produc"on. Astringent herb used for treatment of diarrhea and dysentery. “Look-Alike” Species Quick ID Pink-purple flowers in long, dense clusters. Leaves opposite. Square stem. Found in most habitats. 28 Fireweed, Chamerion angusfolium/ Epilobium angusfolium, also has pink flowers in long, dense clusters at the top of the plant, but has a four-lobed flower and alternate stem leaves. Invasive Plants of the Southern Interior Manual Treatment: Mechanical treatment is best when infesta"ons are small. Seed heads can be cut and removed to eliminate seed produc"on. Rose&es can also be removed mechanically. Larger mature plants may require digging to be uprooted. Bag and remove all stems to prevent new plants from sprou"ng. Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Flowers: Flowers in long, dense, ver"cal clusters (or terminal racemes) with leaves. Showy flowers with 4 to 8 wrinkled petals. Sepals have 8, 10 or 12 prominent green veins. Leaves and Stems: Opposite leaves without stalks, some"mes in spirals (or whorls) around the stem. Lance-shaped, slightly hairy with smooth edges. S"ff, square or octagonal stem. Can be smooth or with so# hairs. Seeds: Numerous brown to black seeds in a small, brown, two-chambered capsule. Can produce over two million seeds annually. Viable for up to 20 years. Roots: Woody taproot and extensive branching fibrous root system. Reproduc!on and Dispersal: By seeds and underground horizontal roots (rhizomes). Detached root or stem fragments can also form new plants. Habitat Preference: Near shorelines in wetlands, floodplains, ponds, streams, rivers, lakes, ditches, canals and other disturbed wet soil areas. Well-established plants can persist on dry sites for many years. Can tolerate a wide range of growing condi"ons. Invasive Plants of the Southern Interior 29