What is the ideal mason bee hole size? When we build nests for mason and other solitary bees we are typically catering for a broad range of solitary pollinators.
The nest I built for her was designed to be attractive to a broad range of solitary pollinator bees such as mason bees, leafcutter bees, and carpenter bees.
Cut sections of this wood that are 7-8″ (20cm) long. I find that the bees seem to prefer if the wood is placed end on – ie if you cut the log such that the cut is across the grain. Then you are looking at the rings in the wood.