Have chickens, now have chicken poop. I read some where you can only put aged manure on plants. What is " aged"? I have a cement bottem coop, I have 6 to 8 inches of straw down. The chickens keep it fluffy because they scratch in it. I have 18 chickens. I live in Wisconsin so they stay in the coop most of the time now. In the past I have tossed it (the poo) under some huge pine trees by the pond. I have a 30 by 100 foot garden and use straw to keep out weeds. So my question is, how do I mix the plants and the poo?