Sunflower seeds are favored by most of the birds that visit our backyard feeders. The problem is that many birds such as cardinals and finches crack open the seeds at the feeder. Consequently, in a short period of time the sunflower seed hulls build up below our feeders. These hulls need to be regularly removed.
The hulls contain a chemical that will retard the growth of many plants. Consequently, if they are not removed you are left with a barren area directly beneath your feeder.
In addition, they pose a health hazard to birds. The hulls become a breeding ground for bacteria and fungi. Feeder birds come in contact with bacteria and fungi when they feed on the seeds that fall from the feeder. Many of these dangerous organisms can cause birds to become sick or even die. With that in mind, make a point of regularly raking up the hulls and disposing them in the trash. By so doing, your feeding area will remain attractive, and you will reduce the chance that the birds using your feeders will become infected with a life-threatening disease.
