Update- I decided not to use the spent Brewery grains and have decided to add Liberal amounts of mushroom compost and Alpaca poo. The mushroom compost has been spread about 4-6" deep in the garden and this evening am picking up 2 55gal drums of Alpaca poo. Once scattered I will till it all in about 6" deep and he ready to plant in about 10 days.
I found a guy about 10 minutes away who raises Alpaca and currently has 12 animals. He said his whole raised beds are 100% Alpaca poo and he said he gets excellent results. I don't plan on going that extreme, but it's nice to find a local source as a yearly amendment.
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