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