- Introduced from Europe and Asia to the Atlantic coast of North America in the early 1800’s.
- Up to 2 meters tall with several stalks covered in pinkish-purple spike-like flowers.
- Flowers bloom from late June through to September.
- Square 4-sided stem, lance shaped leaves that are arranged opposite from each other.
- Produces 900 to over 2.5 million seeds per plant (dependant on age, vigor and size of plant).
- May spread via plant parts, especially the roots.
Consequences of invasion
- Forms dense stands with thick mats of roots, which degrades wetland habitats.
- Decreases biodiversity.
- Large infestations can clog irrigation canals, degrade farm lands and reduce forage values of adjacent pastures.
- Best time to remove Purple Loosestrife is June, July and early August, when it is in flower and before seed set.
- Dispose of Purple Loosestrife by bagging and disposing at your local landfill.
- Biocontrol agents are available for this plant.
More information available:
Invasive Species Council of BC Factsheet
CKISS Downloadable PDF: CKISS Detailed Profile
ISCMV Purple Loosestrife Best Management Practices
Ontario’s Invading Species Awareness Program
Purple Loosestrife Manitoba: Manitoba Purple Loosestrife Project