Add more valuable bee pollinators to your garden with Honey Comb Modular Mason Bee House. They are called Masons because they work with mud to build and seal their nests. Mason Bees are attracted to flowering plants, such as vegetables, fruit trees & bushes, flowering annuals, perennials and vine plants. These Honey Comb-shaped Mason Bee Shelters can be connected together to create a larger colony. Mount to a post or wall ideally near a source of mud. For best results, use near flowering plants known to attract bees. The fiberboard nesting tubes should be replaced each spring after Mason Bees have emerged from their nests.