Our Mason Bees did wonderful this year and we had a very late spring with 2 feet of snow in mid April. Mine didn’t do anything last year but I got 8 cocoons from my sons’ batch ( he managed to save cocoons from the year before) and my little house has 2 full holes and a few that look half full. His, however is packed, every hole is full so we will have lots to harvest this fall.
Not much was in bloom when we put them out this spring, we bought pots of flowers and put them underneath the house so they would have something to eat. I wonder if the lack of blossoms is a slight bonus, not much chance of going father away if the most of the food source is close to the house.