Mason bees were attracted to our bee box at the allotment last May, it was fascinating watching them building nests within the hollow tubes. Mason bees are non-aggressive solitary bees, they are very small and do not sting unless really threatened (a sting is not usually painful and only females are capable). They do not swarm, bother people or produce honey, but they are prolific pollinators. Named because of their habit of making compartments of mud in their nests, which are made in hollow reeds or holes in wood. Mason bees will also use handmade or purpose-built bee boxes to nest, hollowed out bamboo canes or tubes will attract them, drilled holes in wood blocks will attract them too.
Nest building begins in spring, it’s a good idea to have a bee box in place beforehand if you’re thinking of providing a nesting site to attract them to your garden or allotment. Site bee boxes in a position that receives early morning sun, on a tree, post, wall or shed for example. Have a go at making your own Mason bee box or purchase a ready-made box suited to Mason bees. I particularly like these examples http://myfriendlygarden.co.uk/product-category/for-bees/