In a short while the birds will start feeding heavily at the seed feeders, but that holds no appeal for the eastern bluebirds. They prefer meal worms and, although I draw the line at live worms living in my refrigerator, I have been able to entice them to eat dried worms instead.
I constructed my bluebird feeder from two lengths of white cedar, a 1930’s aluminum serving dish and a plastic plant tray.
The main post is dug into the ground for about a foot and extends about 4′ high. I drilled the top of the tall post and both ends of the short (8″) post that sits inside the bowl; I also drilled a hole in the center of the bowl (vintage aluminum is soft and easy to drill). Then, with the bowl sandwiched between them, I joined the short post to the long one using a double ended screw.
When I drilled a hole in the plastic plant tray that I used for the roof, I put some masking tape on both sides of the tray to prevent cracking. I removed the tape after I drilled the hole and then I sandwiched the tray between a couple of large washers and screwed it to the top of the shorter post.
It is also a good idea to drill a couple of drainage holes around the bottom of the aluminum bowl so the food doesn’t turn to mush every time it rains.