Partly bivoltine: From the end of March or early April to mid July. However, in Devon a freshly emerged male and female have been collected in late June, a female in mid July and another in mid August; these may represent a second brood. In September and early October 1989 (at the end of one of the driest summers on record) several females were observed visiting Colchicum autumnale in a west Cornwall garden (E.C.M. Haes, pers. comm.); these females were similarly assumed to belong to a second brood (Else & Edwards, 2018)
In Thessaly (Greece), Standfuss et al. (2011) report flight activity from March to May
Parasites and predators The bees Nomada marshamella and Nomada flava are cited as cleptoparasites of this species (Söderman & Leinonen, 2003) .
Stubbs (2001) citing Paxton et al. (1996; 1999), suggests that the bee-fly Bombylius major may be an inquiline in nests of this species.