Unfortunately, I think we missed the window for this year. It sounds like mason bees seal up cocoons in early summer. I found page on making wild bee sanctuary

Unfortunately, I think we missed the window for this year. It sounds like mason bees seal up cocoons in early summer. I found page on making wild bee sanctuary: https://davidsuzuki.org/living-green/how-to-grow-a-wild-bee-sanctuary/ https://davidsuzuki.org/living-green/how-to-grow-a-wild-bee-.... And one on mason bees: https://davidsuzuki.org/living-green/how-to-support-mason-bees-year-round/ https://davidsuzuki.org/living-green/how-to-support-mason-be....