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purple loosestrife (Lythrum salicaria)
ODA rating: B
USDA Symbol: LYSA2
Oregon purple loosestrife distribution
Other common names
purple lythrum
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Image courtesy of Bonnie Rasmussen, Oregon Dept. of Agriculture
Image courtesy of Eric Coombs, Oregon Dept. of Agriculture

Image courtesy of Bonnie Rasmussen, Oregon Dept. of Agriculture
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
Perennial; blooms midsummer. Grows up to 7 ft tall. Upright bushy plant. Flowers pink to purple, possessing 5-6 petals and numerous on a long spike. Spreads by seed and spreading rhizomes that form dense, woody mats.
Its showy purple flowers crown a vigorous plant that crowds out marsh vegetation required by wildlife for food and shelter. Decreased waterfowl and songbird production has been well documented in heavily infested marshes.  This former ornamental species can be found along wetlands, stream banks, and shorelines of shallow ponds.
Eurasian in origin, this aquatic invasive has become established in the U.S.
Distribution in Oregon

Biological controls
Four biocontrol agents, two leaf beetles, a root weevil and a seed weevil, are approved for release and are established in Oregon.

Galerucella calmariensis
Galerucella pusilla
Hylobius transversovittatus
Nanophyes marmoratus