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Found in marshy habitats, Purple Loosestrife, Lythrum salicaria, forms tall spikes of purple flowers, which appear between June and August. It forms clonal colonies, with multiple stems from the same root mass. It has also been used as a garden plant, being particularly suited to damp areas, and may be marketed under the name European wand Loosestrife. According to the Roman naturalist Pliny, Lythrum derives from Lysimachus, one of Alexander the Great’s generals, whose name means loosing strife. The species name, salicaria, derives from the willow, or Salix, due to the similarity in leaf shape.
Though native to Europe, temperate Asia and North Africa, it has become naturalised in other countries. In the USA, it is considered an invasive weed due to the dense clumps it forms, out-competing native species.
The flowers provide a good nectar source for long-tongued insects, and there are also five beetle species which use it as their primary food resource, including the black-margined loosestrife beetle Galerucella calmariensis, and loosestrife root weevil Hylobius transversovittatus. These species have been used successfully for biological control of purple loosestrife.
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