I use this for the porch,pool plants.They give off a nice aroma of coffeethey disperse top ground water evenly.I imagine a fabric cover,then half to one inch inside those boxes.Only downside is the mold ,overnite forming(they do advise you)and a spritz of vinegar will knock it down if it bugs you.They sun will do the trick.Second year for me.This year side by sides as a mix.Hey coffee grounds have their merit.It breaks down,it does dry shiny,nice touch for ornamentals.
https://www.amazon.com/s/?ie=UTF8&ke...l_5zpb8sazhh_b
Ps there is a discussion about,here somewhere last year.