Early this spring we created a number of bee nesting blocks for a program Jennifer helped present and, of course, also created one for ourselves. We found the plans in this great book put out by the Xerces Society:
We first thought to use some of the old 4x4s laying around, but opted against them since they are treated. We purchased a nontreated 4x4 from a local big box store and got to work. First, cut to length!
Angle cut the top of the bee block and add a roof as well. We want all the best for our bee friends!
Draw a pattern with specified spacing for specified hole sizes (see book) and drill the holes.
Early this spring, we placed our bee block in our garden by setting it on a cabinet and facing it east to help minimize weather effects. Take a look at those holes in September!
Yeh! Many are now plugged by the adult female bees. There are probably 3 or so bee larvae in each hole now, each in their own cell created by the adult bee. Most will emerge next spring/summer.
What an easy project to help attract native bees to your garden for all their pollinating services!