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I put a couple of mason bee houses on the north side of the shed a couple of years ago. They really took off this year in the early spring. It's fun to watch them flying around. The ones I put up were a gift, and they're not as deep as they should be. They need to be at least 6" deep because the female eggs are deeper in the hole than the males. If they aren't deep enough, you'll get too many males and not enough females. Males die after mating, and the females are the ones that do the bulk of the pollenating.
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