Provide a home for one of nature's best pollinators. Of the more than 20,000 species of bees, two of the most common are the blue orchard bee and the horn-faced bee. One-half to two-thirds the size of a honey bee, these passive bees live only six to eight weeks but lay eggs in this house. The eggs remain dormant through the fall and winter, and offspring emerge in the spring to pollinate plants. Hangs near the garden and requires no maintenance.