I made some native bee houses to sell at the Shaw Wildflower Market and have a few left over if you would like to purchase one for your garden or as a gift. They are about 6" square cedar and will attract many species of solitary bee to lay eggs, insuring a future generation of pollinators for your garden. I'm selling them for $15 each plus delivery fee if that is necessary.
Below is a bee house I made last year. I set it on my front porch next to my house plants and just left it alone. Soon I noticed the bees filling in the holes with flower petals and mud. The mother bee selects a hole and lays an egg in the back, she then provides the egg with a ball of pollen for it to eat when it hatches. After that she seals up the hole with leaves, mud, or other materials from your garden. It takes several trips so it is fun to watch. Each hole will have several egg chambers. After the baby bees hatch they chew their way out and start pollinating your garden. The bees that like these houses are not honey bees and are very unlikely to sting you since they don't have a hive to defend.
You can also make your own bee house by following these instructions.
http://www.xerces.org/wp-content/uploads/2008/11/nests_for_native_bees_fact_sheet_xerces_society.pdf
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