Centaurea cyanus
Other insectary plants include: mustard plants such as "Brassica juncea", "Phacelia tanacetifolia", buckwheat ("Fagopyrum esculentum"), marigold ("Tagetes patula"), elderberry, Korean licorice mint ("Agastache rugosa"), blackberry, "Convolvulus", "Crataegus", Anthriscus sylvestris, Chrysanthemum segetum, Scrophularia, Rosa canina, Hedera helix, Centaurea cyanus, Phacelia tanacetifolia, Escholzia californica, Prunus spinosa, Lobularia maritima.