A bulbous perennial herb of moist woodlands, sometimes growing in more open situations such as riversides and hedge banks and occasionally in rock crevices, in scree and on coastal cliff ledges. Regeneration is primarily by seed. Generally lowland, but reaching c. 450 m at Great Clowder, Malham (Mid-W. Yorks.).
There is little evidence of significant distributional change in this species since the 1962 Atlas, where it was mapped as `all records`.
European Temperate element.
Light (Ellenberg): 4
Moisture (Ellenberg): 6
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.5
July Mean Temperature (Celsius): 14.8
Annual Precipitation (mm): 1065
Height (cm): 45
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 2034
Count of 10km squares in Ireland: 371
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: 0.24
Weighted Changed Factor: 20
Weighted Change Factor Confidence (90%)
Atlas text references
1988. Comparative Plant Ecology.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1996. Flora Britannica.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1957. Biological Flora of the British Isles. No. 63. Allium ursinum L. Journal of Ecology. 45:1003-1010.