Name: Big Bill Livonia Michigan (Zone 6a) If you need to relax, grow plants!!
Charcoals main purpose is to sweeten the soil. It buffers the soil and helps to keep it less acidic. I would think that this would be the case if you are going to bury it under another layer.
It may add a little humidity if it is wet all the time.
Evaporative coolers work because you draw air in using fans across a wet substrate causing the air to become cooler.
Orchid lecturer, teacher and judge. Retired Wildlife Biologist. Supervisor of a nature preserve up until I retired.
