As this is a cleptoparasitic species, all flower visits will be for nectar only.
Flowers visited: Rubus (Rosaceae) and doubtless species in other genera.
In Sweden, Lotus corniculatus (Fabaceae) and Chamerion angustifolium (Onagraceae) have been recorded for this species (Erlandsson, 1955).
Pawlikowski & Kruszynski (1997) list Anchusa officinalis (Boraginaceae) as a nectar source in Poland.