Geranium macrorrhizum is a species of hardy flowering herbaceous perennial plant in the genus Geranium, Geraniaceae family. It is native to the South east Alps and the Balkans. Its common names include bigroot geranium, Bulgarian geranium, and rock crane's-bill.
It has five-lobed (palmate) leaves that are aromatic when crushed, with pale pink flowers in summer. It is cultivated as an ornamental plant in temperate regions, where it is used as a flowering groundcover, with named cultivars selected for flower colors from white through pink to magenta. The cultivar 'Ingwersen's Variety' (pale pink) has gained the Royal Horticultural Society's Award of Garden Merit.
The plant is used for medical purposes in the traditional herbal medicine since it possesses high antimicrobial  properties. Essential oil is prepared from it so it is also used in aromatherapy. In Bulgaria an oil is extracted from this plant, the name of which in Bulgarian means 'the healthy one'. In addition to essential oil, it contains flavonoids, sesquiterpenes, phenolic acids, pigments, vitamins, and mineral salts. A major component of essential oil is the sesquiterpene ketone germacrone.
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- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.
- "Geranium macrorrhizum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 19 January 2018.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "RHS Plant Selector - Geranium macrorrhizum 'Ingwersen's Variety'". Retrieved 17 July 2013.
- "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 43. Retrieved 2 March 2018.
- Niko S Radulović, Milan S Dekić, Zorica Z Stojanović-Radić, Suad K Zoranić. Geranium macrorrhizum L. (Geraniaceae) essential oil: a potent agent against Bacillus subtilis. Chemistry biodiversity (2010). Volume: 7, Issue: 11, Pages: 2783-2800
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