Pollen analysis of nest contents of a Norwegian nest show the species is polylectic, collecting pollen from Salix (Salicaceae); Vaccinium myrtillus, Vaccinium uliginosus (Ericaceae); Lotus corniculatus (Fabaceae); and Pedicularis sp. (Scrophulariaceae)(Løken, 1973)
Other flowers visited include: Saxifraga aspera (Saxifragaceae).