The EnvPLan exam may have you mixing your soils learning with coffee dosing. What would happen if you added coffee grounds to the soils in your garden?
Starbucks says: Well, it adds organic matter that is rich with nutrients, especially nitrogen. The only downside is that it is pretty acidic so you you want to mix it with other organic matter (like leaves) or use it in places where you need the acid.
They were even giving away the grounds in Hawaii for a little while.