The {blue bee or] orchard mason bee, Osmia lignaria, is a megachilidbee that makes nests in reeds and natural holes, creating individual cells for their brood that are separated by mud dividers. They are unlike carpenter bees in that they cannot drill holes in wood. O. lignaria is a common species used for early spring fruit bloom in Japan, Canada, and the United States, though a number of species of other Osmia are cultured for use in pollination.