Excavator: Ground. Excavated burrows (3-5cm deep) in loose sandy ground with one cell at the end or with several cells constructed closely side by side. The burrows are often near dead plants whose roots serve to attach the cells in the ground. Reports on nesting in empty snail shells are wrong.
Nesting material: The cells are entirely made of chewed leaves (e.g. from Lotus, Medicago, Convolvulus, Cistus, Ononis). (Haeseler, 2005, 2008; G. Le Goff, personal observation)