Outside
Ive taken my basically "dead" blocks of substrate outside to dump in one or the other of my gardens. Though its much too hot here to have a mycelium garden, i did watch paul staments talking about how bees love mycelium. Anything to save the bees! So i just dump the blocks into the gardens and keep watering. If even a tiny bit of mycelium survives i believe that is a good thing. A few times ive gone out and to my surprise ive found little shrooms growing. Here in tx i will never have a "crop" outdoors but its always fun to find random little shrooms growing from the dead blocks.