Droll Yankees
Hungry birds will adapt as best they can to the conditions in order to survive and larger birds will sometimes hang onto the collapsed perch and continue to feed. It is uncomfortable for them and difficult so it discourages them but might not be the ultimate preventative.
Castine Blend Organic Raised Bed Mix
Quoddy Blend Lobster Compost
Bar Harbor Blend Organic Potting Soil
Schoodic Blend Cow Manure Compost
Black Oil Sunflower