Dahlia Growing Resources
Here are some resources from the American Dahlia Society & the Minnesota Dahlia Society on how to grow and care for your dahlias:
Fundamentals of Growing Dahlias - The American Dahlia Society
New Dahlia Growing Guide - Google Docs
Preparing-for-a-Dahlia-Garden.pdf
Digging, Dividing, and Storing Tubers - The American Dahlia Society