How to make a gourd birdhouse
When your gourd is completely dry, make a hole in the gourd to allow the birds to enter. The hole will need to be a suitable size for the bird you are making it for.
To make the hole, use a hole saw bit that fits into an electric drill. A perch can be added beneath the entrance hole if required. Drill a few small holes into the base of the gourd to provide drainage to keep the gourd dry. Drill a couple of small holes at the top so you can insert string or wire for hanging. Drill a couple more for ventilation.
Use a long-handled spoon to remove the seeds and membrane through the entrance hole.
After the gourd is cleaned out, apply a wood preservative to seal the outer surface. Once dry, you can sand it smooth, then paint with an oil-based primer. Allow to dry again, then apply a topcoat. Be careful not to clog the drainage holes.