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Quite a few new mason bee enthusiasts have asked me about nest location.
The best location for nests optimally includes the following:
1) East facing-bees can warm up early in the morning
2) Sunny-warmth provides adult mason bees energy to fly and provides warmth for larvae to eat.
3) Underneath over hang- protects nest and bees from getting wet.
If you don’t have all three factors at any one location, you may have to make a choice.
You may want to try nests at different locations. This will tell you which is the best location for the bees.
For more detailed information see my book “Pollination with Mason Bees” pages 31, 49-50.