My chickens live in a big coop on dirt that I started with several bales of pine shavings about 4 years ago and have been adding shavings with minimal removal until this December when I scraped the top inch or so off to the side and dug out about 10 wheel barrows to top off my garden beds. That barely put a dent in the accumulated litter. I want to do a potato tower this year. I would like to use my litter for the potato tower and I think it will be OK having sat there for several years and mixed with the wood shouldn't be "hot". Is there something I am missing?