Det här är "Tight Little Stitches in a Dead Man's Back" (1992) av Joe R. Lansdale.
They did it — they launched the damned nukes and the world went pretty much straight to hell. Not many survived, but some of those who did emerged twenty years later, to a world where mutant whales heaved themselves across the blackened, dry seabed of the Pacific, and the roses… oh God, the roses.
Jag tror att antologin är Wastelands 2 av John Joseph Adams.