The larvae of the Mormon Metalmark feed on Buckwheats, Eriogonum spp. In particular they like Eriogonum fasciculatum, California buckwheat. It forms a two to three feet tall nicely rounded bush. Their white flowers dry to a chocolate color that lasts till the rain knocks them off in the winter. It is also very drought tolerant, surviving in hot, arid, chaparral.
The adult Mormon Metalmark feeds on various flowers. They seem to like asters like Butterweed as well as Joaquin Daisy and California Aster.