Keep your own mason bees in tubes. The tubes should be printed vertically with a raft.
Overview and Background
Allow nearby mason bees to colonize the tubes and help pollinate nearby plants.
Lesson Plan and Activity
How to use
You need to have mason bees. If there are some near your area, they should be able to set up easily. if there are none, you need to acquire some online. Ensure that the mason bees can have access to muddy soil to build their nesting chambers. Further instructions may be found online.