well i garden out of pots on my back porch and when the plants die or i decide to dig them up i take the pant and the soil to them and dump it in a spot in their run and they do that they also eat the roots of the plants and the plants themselves today i took all kinds of stuff out there to them today!!! i took som corn husks, green bean ends, tomatoes, green peppers, eggplants, green beans, and all kinds of plant life and then i dumped out all of that potting soil out there and they love it!!!! the ducks root around in it the chickens roll around and take baths in it they love it that is what i do and when my cousins are done with there sand boxes i put there old sand in a kiddy pool for them!!!