Forest-habitat-specialist
Guides
Osmia pumila
Osmia pumila is a solitary mason bee native to eastern North America. It is strongly associated with forest habitats, where it performs spring pollination of wildflowers and possibly some timber trees. The species nests in pre-existing cavities such as hollow stems or holes in wood, sealing brood chambers with mud. Research indicates it is one of the most common forest-associated bee species in the eastern United States, with populations increasing as forest cover has regrown since the early 1900s.