Geranium robertianum

Tracheophyta MagnoliopsidaGeraniaceaeGeraniumGeranium robertianum


An annual or biennial shade-tolerant herb found on a wide range of soil types, except those that are strongly acidic. Its habitats include woods, hedgerows, walls, shaded banks, limestone pavements, screes and coastal shingle; also in disturbed artificial habitats. 0-700 m (Great Dun Fell, Westmorland).



World Distribution

European Temperate element; also in C. and E. Asia and widely naturalised outside its native range.

Broad Habitats

Light (Ellenberg): 5

Moisture (Ellenberg): 6

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 6


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.6

Annual Precipitation (mm): 1092

Life form information

Height (cm): 50

Perennation - primary

Biennial, including monocarpic perennials

Perennation - secondary


Life Form - primary


Life Form - secondary

Therophyte (annual land plant)

Comment on Life Form

"CTW & Stace say ""annual or biennial"""



Clonality - primary

Little or no vegetative spread

Distribution information

Count of 10km squares in Great Britain: 2552

Count of 10km squares in Ireland: 939

Count of 10km squares in the Channel Isles: 13

Atlas Change Index: -0.41

Weighted Changed Factor: 13

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

Atlas (94a)
Atlas Supp (16a
Baker HG
1955.  Geranium purpureum Vill. and G. robertianum L. in the British Flora: I. Geranium purpureum. Watsonia. 3:160-167.
Grime JP, Hodgson JG, Hunt R
1988.  Comparative Plant Ecology.
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Meusel H, Jäger E, Rauschert S, Weinert E
1978.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.
Stace CA
1997.  New Flora of the British Isles, edn 2.