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Cut the plank into four pieces to make a rectangular frame for the bee hotel. Drill guide holes for the screws and assemble the frame as if making a box. Paint the wood if you would like to and allow to dry.
Use secateurs or a saw to cut your stems to the same depth as the box. A saw is preferable to secateurs for thicker stems as the stems are less likely to split. Sand away any rough edges.
Carefully pack the frame of the bee hotel with the stems – only as you add the final few does the whole lattice lock solid. Hang your bee hotel on a sunny wall, sheltered from the rain, and wait for the mason bees to investigate it in the spring.