Dahlia-net
- Discussion group where growers can talk about dahlias.
- http://tech.groups.yahoo.com/group/dahlia-net/

The National Dahlia Collection
- Supplies rooted cuttings and pot tubers of cultivars and species.
- http://www.national-dahlia-collection.co.uk/

WebEgan Dahlia Garden
- Home gardeners showcase their dahlia collection and provide information and links for growing dahlias.
- http://www.eganplace.com/dahlia/

Dahlia Diseases
- Brief descriptions of diseases that afflict dahlias.
- http://www.ppath.cas.psu.edu/EXTENSION/PLANT_DISEASE/dahlia.html

Dahlias in B.C.
- Information and articles on the culture and breeding of Dahlias.
- http://www.members.shaw.ca/hydahlia/

American Dahlia Society Classification and Handbook of Dahlias
- Classification lists, glossary of terms, awards and honors.
- http://www.dahlia.org/guide/index.html