Native Bees and Flowering Trees

Knox Cellars Native Pollinators
https://www.knoxcellars.com/Merchant5/merchant.mvc?Screen=SFNT&Store_Code...

Osmia taurus - an introduced species crowding out some native species.

The Arbor Day Foundation
http://www.arborday.org/shopping/memberships/memberships.cfm?trackingid=528