Too many coffee grounds

Asked March 31, 2014, 9:31 AM EDT

I get free coffe grounds from a local coffee shop. Can I put too many on my garden?

Allen County Ohio

1 Response

Yes, coffee grounds are extremely high in nitrogen and very acidic. I would recommend composting the grounds with a 4 part raw yard waste to 1 part coffee grounds by weight. It is also recommended that you add agricultural lime to your grounds to neutralize the acidity. A one cup for every 10lbs of raw coffee grounds. Typical coffee grounds will contain approximately 1.5% Nitrogen, a lot of Magnesium and Potassium. Yet, not a lot of Phosphorus (flowering nutrient) or Calcium which explains the high acidity. Lime is essentially Calcium Carbonate. If Lime is unavailable, wood ashes are also high in Calcium.Thank you for submitting your question to "Ask an Expert!"