@Naeem and @zendog I know are in the DC area and @wildforager is the source for Cornelian cherry info for sure.
I am a DC native also but I currently reside in NJ. Mulberries grow well everywhere DC is no exception there. Trifoliate Orange have no problems if you want to dream of citrus. Goumi’s will likely grow well any ware and they taste basically like a sour cherry.
As for actually cherries there Dr. Meaders cherry hybrids. There supposed to be mildew resistant. and Nankings are an option.