I have to wonder about all the discarded food. Do you really want what is in that "food" to feed to your chickens? They are usually heavily treated with pestacides, unless you are sneaking behind an organic market, plus LOTS of chemicals, especially in lunch meats etc. To me the point of "knowing" what I feed my chickens then hence put into my body is the whole point of having the chickens. There are healthier ways to do this. If you have little space, wine barrels make great planters and can grow lots of things. Sprouted food such as alfalfa, (and yes, it will sprout from left over hay, I have even had Wheat Straw sprout and my cows LOVE IT!) oats, etc., are a great nutritional source and much healthier than all the "Chicken Junk Food".
I do a program where we take 5 gallon home depot buckets, drill a few holes in the bottom, then use the lids to catch extra water and plant what we call a "Bucket o' Pasta Sauce". We include one Roma tomato plant, some italian parsely, etc. These have worked well for the groups we make them for (charity project). You could turn this idea around and plant some chicken healthy foods.
Just my input on the whole collecting garbage idea. So instead of flowers per say around your porch in planters, plant some chicken health food.