Female mason bees build the walls of their nesting chambers out of mud or other “masonry” products to give each developing bee its own room in the nesting chamber. Female mason bees will then secure the nesting chamber with a thick mud end-cap to protect their offspring from predators until they emerge to pollinate the following spring.
Because mud is vital for mason bee reproduction, females will not nest if they do not have a reliable source nearby (within 25 sq. ft.). However, not just any mud will do! Mason bees prefer to use mud with a high clay content.
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