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Family: clethraceae
Common name(s): sweet pepperbush
Hardiness ratings: USDA zone 3~4 - 8~9 
General resources
Links for Clethra alnifolia
- Carolina Nature - Illustrated woody plant profile, with notes on range and identification.
 (4 photos)
- Connecticut Botanical Society - Wildflower profile. (4 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3b-9) (10 photos)
- Denver Botanic Gardens: Clethra alnifolia 'Hummingbird' - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 3) (3 photos)
- Digging Dog Nursery: Clethra alnifolia 'Hummingbird' - Catalog page with descriptive information (additional pages for other varieties) (1 photo)
- Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 4-9) (2 photos)
- Garden.org - Community-assembled plant profile (5 varieties in database) (2 photos)
- Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (60 photos)
- 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 3-9) (8 photos). Also pages for 'Batsto Blush', 'Caleb' VANILLA SPICE, 'Crystalina', 'Hummingbird', 'Pink Spire', 'Rosea', 'Ruby Spice', 'September Beauty', 'Sixteen Candles', 'Sotite' WHITE DOVE, 'Tom's Compact', and SHERRY SUE.
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 3-9a) (13 photos). Also a page for 'Crystalina' PP21.
- Ontario Rock Garden Society - Germination information. Also a page for 'Ruby Spice'.
- Paghat's Garden: Clethra alnifolia 'Pink Spire' - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations.
- Rob's Plants: Clethra alnifolia 'Hummingbird' - Plant profile with basic horticultural information and often personal observations. (zone 3-9) (1 photo)
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)
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