[Some Fat Guy in L.A.]

Used to work with a guy that raced pigeons for a hobby. He told a story about a guy that cleaned out his coop intending to use the droppings to fertilize his lawn. Instead he got a lawn full of whatever weeds that the pigeons had been eating as seed.

[SunkenCiv]

There’s an old practice to deal with that problem, it’s called “weeding”. Also note that the birdies were probably being fed a steady diet and having their wings clipped to keep them on the site.

[Harmless Teddy Bear]

That is why you compost.

But if the birds were being fed the same seed as they were planting in the fields then you get much better results.