Renter: Existing cavities: cracks and holes in rocks and stones. The two only nests recorded so far contained one single cell and two cells closely beside each other, respectively.
Nesting material: The cells, which are not glued to the substrate, are three-layered: the outer and inner layer consist of large pieces of petals (e.g. of Geranium, Linum), the central layer is built of mud. (Warncke, 1988b; Rozen et al., 2010)