Hi, I have 16 chickens that I'm spoiling because they were mistreated at their last home. I like to let them out in the garden so they can "stretch their wings" and get out of their 10x20 run. I have raised beds throughout that last year held tomatoes, potatoes and mint. The chickens cannot get in the tires that had tomatoes; the mint is long gone, now in my home in a pot but I give them some every so often as it grows because they love it. The problem is most of the garden had potatoes. Can the roots/rotten potatoes left in the ground harm the chickens if they eat them? I've read about the "green skins" but what about potatoes that used to have green skins but have been underground, covered with snow, and frozen this winter; potatoes that are now all mushy under the dirt; will those harm the chickens? I've been letting them out because I pulled out all that I could find before I let them start foraging. Yesterday though I found a rotten fingerling potato in the garden and that got me worried. Thankfully I haven't lost any chickens recently but can any of it be causing organ failure? Help, I need my mind relieved or know that I need to keep the chickens locked up from now on. I'm also worried because I've seen black poop several times this week. Now they may be eating some of the "charcoal/ash" I spread but if it's organ failure I need to know. I've googled and googled but haven't found anything that answers these questions. HELP and Thanks again!