Did you ever think about what seeds are in your birdseed? I never have, but it's obviously seed from plants, flowers, etc. I put a bird feeder outside of the patio and the birds went nuts!! I'm not kidding, we had at least 40 birds on the patio at once. Doves, finches, bushtits, you name it we had it. Anywhooo...it became obvious that the seed was going everywhere. After awhile I had grass growing out of my pots and some lovely daisies. Who knew that birdseed would grow and bloom!!!