This collection contains correspondence, articles, minutes, publications, and financial records from the American Dahlia Society (ADS) that provide details of the organization's development and activities. Minutes from the annual meetings include reports from the treasurer and from committees such as the Trial Garden Committee. Also a part of the collection are articles written by Henrietta Maria Schroeder Stout (1875-1942), dahlia breeder, gardener, author, and founding member of the American Dahlia Society as well as an authority on dahlias. Biographical details, clippings, and research collected by ADS former president Harry A. Rissetto about Stout and her New Jersey garden "Charlecote" are also included.