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Family: betulaceae
Common name(s): corkscrew hazel, Harry Lauder's walking stick
Hardiness ratings: USDA zone 3~4 - 8~9 
General resources
Links for Corylus avellana
- BBC Gardening - Plant profile with horticultural details and garden uses.
 (1 photo). Also pages for 'Contorta' and 'Fuscorubra'.
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (5 photos)
- Denver Botanic Gardens: Corylus avellana 'Contorta' - Description, native range, and cultural requirements. (zone 4) (8 photos)
- Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 4-9) (2 photos)
- Garden.org - Community-assembled plant profile (4 varieties in database) (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 pages for 'Contorta' and 'Red Dragon'.
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-8a) (34 photos). Also a page for 'Contorta'.
- Ontario Rock Garden Society - Germination information
- Paghat's Garden: Corylus avellana 'Contorta - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (6 photos)
- Plant Delights Nursery: Corylus avellana 'Contorta' - Catalog page with photo, horticultural basics, and descriptive blurb. (1 photo)
- Rob's Plants: Corylus avellana 'Contorta' - Plant profile with basic horticultural information and often personal observations. (zone 4-8) (2 photos)
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)
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