These gentlemen had plenty of cow manure and decided to do something with it...they developed CowPots. The pots are made from nutrient rich composted manure from a methane digester used on the Freund's farm in Connecticut since 1997. They function as a combination organic soil amendment and plastic-pot replacement all in one!
Dehydrating the manure in the digester solves the problems of odor and high nitrate content, producing a material that can work to form the receptacles.
According to the CowPot site, the pots can last months in a greenhouse, but begin breaking down and dissolving within 4 weeks of being in the ground, naturally feeding the plant while decomposing.
In addition to helping get plastic out of the process of gardening for consumers, an added bonus of the CowPot invention is that it reduces the nutrient load that farmers have to deal with, contributing to a cleaner environment.