Hey AFN, Just a thought... I'm considering a organic method to bring up my plants Nitrogen and I wonder what you all have to say about using ground egg shells and used coffee grounds mixed together and added to the top of the soil? Egg shells are 93% Calcium and 1% Nitrogen by volume. I know that there is a understanding that coffee grounds are to acidic and that is true prior to being brewed but afterwards they are very close to pH neutral (between 6.5 - 6.8) and add by volume they are 2% Nitrogen. So what say you?