Behavior
Adult females build an underground nest which they provision with insects particularly of the orthoptera order (crickets, katydids, and grasshoppers). Prey are stung three times, once in the neck and twice in the thorax, and are paralyzed by the wasp's sting. The prey are then carried to the nest. The Great Black wasp is an important pollinator of plants including the milkweeds Asclepias syriaca and A. incarnata. It has also been reported on Daucus carota, Eryngium yuccifolium, Melilotus albus, Monarda punctata (beebalm), and Pycnanthemum virginianum (mountain mint).