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no need worry about decaf mate, the brewing process takes out most of it as well as the acidity
i use coffee ground and egg shell mixed together about 5 parts coffee to 1 part egg shell then put a handful as a top dress on the top of pots. i havent incorporated it into a soil mix besides as G13 mentions. I use alot of spent coffee grounds to feed my worms and use the casting to make a soil mix
“If you can't explain it to a six year old, you don't understand it yourself.” -Albert Einstein