The easiest way to stop bird seed from falling onto the ground is by using a good bird feeder and good quality bird seed. A bird feeder with a tray underneath is a great way to catch any accidental seed fall out as well as a bird feeder that is stationary and not swinging will prevent wasted bird seed falling out. A top tip is to make sure that you only pour a small amount of bird seed into the bird feeder so that is is not overspilling unnecessarily. Buying a good quality bird seed will also ensure that the birds are eating all of the food and not throwing aside the seeds they do not like.