Red Butte Garden has been kind enough to let me monitor mason bees (cavity-dwelling solitary bees) on their property for the last several years. I have seven monitoring locations in the Garden and Natural Area.
I use these wooden "houses" stuffed with Phragmites reeds to attract the bees. Bees in Utah apparently like the reed clusters haphazardly charred with a torch.... so I oblige.
Here are a few of the more photogenic placements. Just out last week.
This year reeds were harder to get due to the flooding. LOTS of water/precip this year!