This fertilizer made from worm castings is entirely waste-free, from contents to packaging. made from feeding university dining hall table scraps to earthworms, who in turn create a potent fertilizer rich in nitrogen, phosphorus and potassium. It's then packaged in soda bottles collected through their Bottle Brigade Program where Terracycle pays 6 cents per salvaged bottle. It's even sent in recycled misprinted boxes from other companies!