One of the Oyster Mushroom projects had a successful flush after sleeping through the winter.
The project started with burlap sacks filled with coffee grounds and oyster mushroom spawn. The sacks were stacked , bunker style outside, and left through the winter.
There was encouraging signs of life this spring and the bunker started getting water regularly. The gunny sack material sprouted mycelium throughout.
I think the burlap material helped keep the moisture correct. This has been a problem when growing oysters in buckets. The material seems to wick the moisture where needed, much like mycelium. No wonder fungus loves burlap! Give it a try,