Hanging plants add life and color to garden areas. Birds, however, may view them a bit differently. To birds a hanging plant may be seen as prime real estate or a great place to hunt food. Either way this is never good for the plant, as rummaging through it and building nests can easily kill the plant. Fortunately, you can send a clear "move on" message to birds.
Place a plastic snake in the soil so that tempted birds can see it. Birds will suddenly lose interest in a planter with a snake. Move the snake around every other day to keep the illusion real.
Stick a pinwheel into the planter's soil to repel birds. Mylar tape and bits of aluminum foil will render the same effect, refracting light and keeping birds away.
Wrap netting around your hanging plant to cut off access for foraging birds. Netting enables the sunshine to get through, but not the birds.
Crisscross fishing line across the soil of your planter to keep birds from nesting in it. Another alternative is a child's Slinky toy to create a rough terrain for birds to dig through.