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Perennials, Weeds > Lythrum > Lythrum salicaria > Lythrum salicaria

Lythrum salicaria


Purple Loosestrife




Origin:  Europe and temperate Asia.
Family
Lythraceae
Genus
Lythrum
Species
salicaria
Category
Perennials, Weeds
USDA Hardiness Zone
4 - 9
Canadian Hardiness Zone
3
RHS Hardiness Zone
H3 - H7
Temperature (°C)
-34.4 - (-3.9)
Temperature (°F)
-30 - 30
Height
0.6 - 1.2 m
Spread
0.6 - 1.2 m
Photographs
Description and Growing Information
Flowering Period
MayJuneJulyAugustSeptember
General Description
An invasive wetland perennial.
Cultivation
Best grown in medium to wet soils in full sun to light shade. Flowering spikes should be deadheaded immediately after bloom to prevent self-seeding. Plants may be sheared to the ground after flowering or if foliage becomes tattered from insect damage. If sheared in mid-summer, new foliage generally will appear in 2 weeks with a possible autumn rebloom. Plants are most invasive in wet soils.
Shape
Clumps.
Growth
Fast
ID Characteristic
Brightly coloured flowers.
Habitat
Wetlands, including lake, pond, stream and swamp margins.
Leaf Description
Downy, stemless, stiletto-shaped leaves grow up to 10 cm and are opposite or sometimes in whorls of three.
Flower Description
Flowers appear in dense terminal spikes up to 45 cm long.
Colour Description
Foliage is green. Flowers are bright magenta to purple.
Notable Specimens
Port Franks, Ontario, Canada.
Propagation
Self seeding and through division of rhizomes.
Ethnobotanical Uses (Disclaimer)
Listed as an exotic invasive species the World Conservation Union’s list of 100 Worst Invasive Species. In some areas it is illegal to plant.
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