Bryant RedHawk wrote:Turkey tail, oyster, lion's mane and other mushrooms (most) are great at decaying stumps with no issues of contamination.
I use a 1" drill bit to make the holes then I fill them with either broken up mushroom caps or I make a slurry and simply fill the cavities I made.
Usually the stumps I need gone are in the 8 to 14 inch range and I try to leave 1" of space between my holes.
If I am drilling from the top of the stump, I go as deep as my drill bit will allow, If I am coming at the sides I again try to go as deep as the bit will allow, the side holes I try to angle so I can pour in slurry without worry that it will all just leak out.
We have 4 stumps that I treated just last year and they are looking like they will be digested by the end of next year.
There is a side benefit to this method, you will end up with the mycelium in your soil, and mycelium in your soil is only a good thing.
Bryant RedHawk wrote:Another good method is to use Lye, you still drill the holes but then fill them with a strong lye solution, this will soak into the wood and it will dissolve from the inside out.
This method takes about one year to complete decay if you use the same number of holes you would for mushroom logs.
Lye is not dependent upon moisture to work so it would work well for you.