Coffee is a good source of nitrogen?

I cant answer any of your questions, but I have used it on my garden. I do know that if you put it on too thick, it gets moldy. I also know that earth worms and night crawlers love it (I have kept them alive over the winter in my frig by adding 1/2 teaspoon to the pint worm container every 3rd day.

I have been told that it lowers your pH of the soil, but I think you would have to add a lot to accomplish that. In some areas you may not want to lower the pH.

I would let it dry out and then sprinkle it onto the garden area, or you could save a lot of it and add it in the spring when you are preparing the soil for planting.

Let us know.

Dwayne

Well, used coffee grounds have a carbon-to-nitrogen ratio of 20-1, which makes it a 'green' element in composting.

Nutrient analysis and other info from Starbucks: