A new distinct cultivar of dogwood, Cornus florida L., named `Appalachian Joy`, is provided. This cultivar is characterized by resistance to powdery mildew, which is superior to most other cultivars of flowering dogwood and similar to `Karen's Appalachian Blush` (U.S. Plant Pat. No. 13,165 P2), `Kay's Appalachian Mist` (U.S. Plant Pat. No. 13,098 P2) and `Jean's Appalachian Snow` (U.S. Plant Pat. No. 13,1099 P2). It also is characterized by producing supernumerary (multiple [4-8]) bracts.