blue orchard bee egg on purple provision This cardboard nest tube has been opened to show an egg of the blue orchard bee (Osmia lignaria) sitting on a provision made the purple pollen of the flower Phacelia tanacetifolia. (Photo credit: Derek Artz, Ph.D.) Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed. Subscribe to Entomology Today! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Search Search for... Search Get Certified!