Crown Bees Mason Bee Attractant Accessories, Invitabee The InvitaBee Plus Bee Attractant for all Osmia species Mason Bees helps to attract mason bees to your bee house. Each package contains 1.5ml of InvitaBee spray attractant and 5 natural reeds. Natural lakebed reeds are a favorite nesting hole for mason bees. Situating these reeds in among your nesting tubes or next to your wood tray will also help to attract females looking for a place to call their own. Made in USA