Mason bees are solitary nesters, but are gregarious so prefer to nest in groups. Males emerge in the spring and females emerge several days later, living for about six weeks. Females mate soon after emerging and begin nesting within three to four days. Females lay a single egg on a nectar-pollen provision and then seal the cell with a thin mud plug. The female continues building the nest in this way and then seals it with a thick mud plug, laying as many as 35 eggs. Larvae hatch from the eggs after a few days and feed on the nectar-pollen provision. The larvae then go through a non-feeding pupal stage. Pupae turn into adults by mid-fall and emerge the following spring.
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