Gardeners know pollinators are essential, especially those industrious bees buzzing tirelessly in and out of squash blossoms and trumpet vines. But one kind of bee may wear your patience thin if you’ve discovered their handiwork: Carpenter bees! If you’ve found perfectly round ½-diameter holes drilled into your deck timbers, wood siding, mailbox posts, or outdoor furniture with a little sawdust beneath the holes, you may be housing these gentle bees.