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Family: scrophulariaceae
Common name(s): rusty foxglove
Hardiness ratings: USDA zone 4~6 - 8~10 
General resources
Links for Digitalis ferruginea
- Annie's Annuals: Digitalis ferruginea 'Gigantea' - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 4-10)
 (1 photo)
- BBC Gardening - Plant profile with horticultural details and garden uses. (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4-9) (9 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 4)
- Digging Dog Nursery: Digitalis ferruginea 'Gigantea Gelber Herold' - Catalog page with descriptive information (zone 6)
- Garden.org - Community-assembled plant profile (3 varieties in database) (11 photos)
- Heritage Perennials: Digitalis ferruginea Yellow Herald - Profile with description and horticultural details. (additional pages for other varieties) (zone 4-9) (1 photo)
- Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4-8) (1 photo). Also a page for 'Gelber Herold'.
- Ontario Rock Garden Society - Germination information. Also pages for 'Gelber Herold' and 'Gigantea Gelber Herold'.
- Paghat's Garden - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (3 photos)
- Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (additional pages for other varieties) (1 photo)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 4-8) (2 photos)
Links
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