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Hibiscus sabdariffa

Family: malvaceae
Common name(s): roselle, Jamaican sorrel
Hardiness ratings: USDA zone 3~9b - 10~11 This is a summary of the individual hardiness ratings given by the links below

General resources

Wikipedia. Online encyclopedia entry (if defined).
Google images. Web search for photographs.
The Plant List. Taxonomical lookup
Catalogue of Life. Taxonomical lookup

Links for Hibiscus sabdariffa

Annie's Annuals: Hibiscus sabdariffa 'Thai Red' (on archive.org) - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 9-11) (1 photo)
Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 9b-11) (14 photos)
Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 8-11) (2 photos)
Garden.org - Community-assembled plant profile (2 varieties in database) (5 photos)
John and Jacq's Garden (on archive.org) - Informational page provided by home gardeners in Malaysia with details on culture and propagation. (zone 8-11) (11 photos)
North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 3-10) (9 photos)
Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 9-11) (4 photos)

Hibiscus sabdariffa subsp. cannabinus

Hibiscus sabdariffa var. rubra

Common name(s): Florida Cranberry, Roselle
Hardiness ratings: USDA zone 9b - 11