I did a few Internet searches and found plans to build a mason bee hive.
The plans were divided into two methods. Small holes drilled in a block
of wood and paper soda straws tied up in a bundle. I made the block out
of a 5x5x12 in piece of wood, Put an old Paterson bluebird house roof on
it and set it in my apple orchard. The idea was to have a source of
pollination for when the honey bees were not flying and when the
neighbors clover field was more enticing...
The first year I had around 25 holes filled and then last year nothing...
I will continue trying this year since you need to build up the
population and continue to add move nest holes each year.
Dick Wm. Waskey
Scandia Minnesota