Petasites fragrans

Tracheophyta MagnoliopsidaAsteraceaePetasitesPetasites fragrans


This dioecious rhizomatous perennial herb is naturalised on streamsides, banks, rough ground and roadsides, where it sometimes forms large, very persistent stands. Lowland.



World Distribution

Native of the C. Mediterranean region in Europe (Italy, Sicily, Sardinia) and of N. Africa.

© M. Cotterill, IWNHAS

Broad Habitats

Boundary and linear features (eg hedges, roadsides, walls)

Light (Ellenberg): 5

Moisture (Ellenberg): 5

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 6


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 4.1

July Mean Temperature (Celsius): 15.3

Annual Precipitation (mm): 941

Life form information

Height (cm): 30

Perennation - primary


Life Form - primary

Non-bulbous geophyte (rhizome, corm or tuber)



Clonality - primary

Rhizome far-creeping

Distribution information

Count of 10km squares in Great Britain: 1328

Count of 10km squares in Ireland: 582

Count of 10km squares in the Channel Isles: 12

Atlas Change Index: 0.8

Weighted Changed Factor: 21

Weighted Change Factor Confidence (90%)


Distribution information

JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references