As this is a cleptoparasitic species, all flower visits will be for nectar only.
It is known to forage at Jasione montana (Campanulaceae), Echium vulgare (Boraginaceae), Trifolium arvense (Fabaceae), Scabiosa columbaria (Dipsacaceae), Thymus serpyllium (Lamiaceae)(Westrich, 1989, 2018).
Celary (1990; 2007) cites Jasione montana (Campanulaceae); Thymus sp. (Lamiaceae) and Centaurea sp. (Asteraceae) as nectar sources in Poland.