A perennial herb growing on the margins of slow-flowing rivers, canals, lakes, flooded gravel-pits, in tall-herb fens and willow carr. It thrives in permanently wet, or periodically inundated, fertile soils and tends to avoid acidic conditions. 0-440 m (Lake Ferta, S. Kerry).
Although there have been local losses due to habitat destruction, this species is a good coloniser and can quickly become established in new sites. It is sometimes introduced to ponds and newly created wetlands. Its overall distribution is probably stable.
Eurasian Temperate element, but naturalised in N. America so distribution is now Circumpolar Temperate.
Light (Ellenberg): 7
Moisture (Ellenberg): 9
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4
July Mean Temperature (Celsius): 15
Annual Precipitation (mm): 1024
Height (cm): 120
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 1692
Count of 10km squares in Ireland: 827
Count of 10km squares in the Channel Isles: 8
Atlas Change Index: -0.08
Weighted Changed Factor: 15
Weighted Change Factor Confidence (90%)
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1992. The biology of Canadian weeds. 100. Lythrum salicaria. Canadian Journal of Plant Science. 72:1305-1330.
1978. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.