The life cycle of most solitary bees fits into a regular pattern. They overwinter as dormant adults in cocoons, and about the time apple trees begin blooming in the spring, the first Orchard Mason males appear. Mating between males and females usually occurs at the nest site, with males waiting by the nest for females to emerge. After mating, the females begin searching for new nest sites, which may be in previously used insect borings in wood, plant canes, underneath clapboard, in masonry weep holes, and of course, in Native Bee houses, if they're lucky enough to find one!