Hi Charles
I have been revisiting my wood chips and the first photo shows from top right anti-clockwise – fresh chips, six months old on the surface, six months old a few cm down on the path, and eighteen months old a few cm down on the path. The second photo shows detail from the old chips. I wonder if it would be ok to use these older chips, which are small and at least partly broken down, to form all the ‘browns’ in a heap to balance the greens from the spent crops and green manure, particularly comfrey.
I am not sure what is the maximum percentage of such older wood chips that could be used.
Thank you very much
John