Uncertain. Either Excavator; Ground or Renter. The only nest found so far was in a 3cm long and vertical burrow in the ground, which was either excavated by the female bee herself or by a an aculeate wasp. It contained 3 linearly arranged cells.
Nesting material: The cells were entirely constructed from several layers of pink and blue petal pieces. The partitions between adjacent cells were made of a thin wall of mud. (C. Sedivy, C. Praz and A. Müller, personal observation; Müller, 2018)