Female, 10-11 mm. Male, 9-10 mm.
Metallic blue, almost black.
British Columbia to Quebec and the New England states, south to California, Oklahoma and Georgia.
Native to the western US.
They occur in woodlands and forest edges.
They visit flowers of cherry, pear and apple and also many others such as quince, laburnum spp and blueberry. The Hosts section on its Discover Life species page
lists known floral associations based on specimen records and images.
O. lignaria are univoltine and winter in the adult stage. Adults are active in the spring, when they build and provision nests. The eggs complete development to fifth instars by early summer; then they spin cocoons and enter a dormant stage. Pupation occurs by late summer, and adult eclosion occurs a month later. Adults hibernate in their cocoons, and emerge in the spring.
It is being managed and developed for use as fruit trees pollinator. Management of O. lignaria
. Field use of an incubation box
The clerid Lecontella brunnea
(Spinola) was reared from the nest of Osmia lignaria
Wings in Flight
. a commercial site with good information on bee housing.