The female mason bee gathers nectar and pollen and stashes it in the back of the hole until there is a sufficient food store for her young. Once there is enough food to supply the larvae, she lays an egg on the food store and then seals it in with a bit of mud. She then brings in more pollen and nectar in front of the previous mud layer, lays another egg, covers it with more mud, and stacks like so until the cavity is full. Once the cavity is full, she seals the hole with a final layer of mud. Maybe you have seen these mud filled holes and wondered what was in there.
Here is a link to more information on mason bees, if you are interested in learning more – http://gardening.wsu.edu/library/inse006/inse006.htm. I think these little bees are pretty fascinating!
We used sections of old fence pickets for the roof (not totally necessary, but shelter from rain is nice, right?) and as a backing to make mounting it easy.
Apparently, it is best to hang the house facing east or southeast, for morning sun. The face of that door frame above is pretty much dead south, so a little variation from that recommendation probably won’t break the deal.
How do you invite beneficial insects to your garden?