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Family: rubiaceae
Common name(s): Madder
Hardiness ratings: USDA zone 4~6b - 10 
General resources
Links for Rubia tinctorum
- Cretan Flora - Botanical description of this species native to Crete.
 (13 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 6b-10) (2 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 4) (5 photos)
- Garden.org - Community-assembled plant profile (1 photo)
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