phrag/ˈfɹæɡ/EtymologyShortening of Phragmites, genus of Phragmites australis.nounPhragmites australis, a monoculture reed grass.“"Phrag is a monoculture that squeezes out all other species." The two phrag programs have been so successful that funding for similar-scale projects is targeting other locations in the tidelands.”