The larvae feed upon more than forty different species of plants including but not limited to; Alfalfa, Aster, Blueberry, Chickweed, Clover, Corn, Dock, Flax, Goldenrod, miscellaneous garden vegetables, Grasses, Mullein, Oats, Raspberry, Rye, Tobacco, and Wheat.
Verbascum densiflorum (dense-flowered mullein) is a plant species in the genus Verbascum.
His work consisted of studies in the fields of floristics, phytogeography and plant systematics, of which he conducted systematic investigations of ferns and also plants from the genera Verbascum, Rubus, Salix, Rumex, Mentha, Rosa, Carex and Epilobium.