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Question about use of coffee grounds

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Question about use of coffee grounds

Post  amcon2 on 6/13/2017, 3:48 am

I put coffee grounds in my compost pile but also add it around my tomato plants.  We drink a lot of coffee Shocked so there is always grounds on hand. Is there such a thing as adding too much around the plants that it would have a negative effect?
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Re: Question about use of coffee grounds

Post  SwampTroll on 6/13/2017, 8:39 am

The issue that comes to mind is every time you're putting grounds around the pot is that you're acidifying the soil a bit.  So if done at too high a frequency you could acidify the soil past the point that the tomatoes like it and they could suffer as a result.

Keep in mind that there are folks on here who have more years of experience gardening than I've been alive.
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Re: Question about use of coffee grounds

Post  camprn on 6/13/2017, 10:44 am

@amcon2 wrote:I put coffee grounds in my compost pile but also add it around my tomato plants.  We drink a lot of coffee Shocked so there is always grounds on hand. Is there such a thing as adding too much around the plants that it would have a negative effect?

Not really, I use them for mulch as well as in the compost pile.

@SwampTroll wrote:The issue that comes to mind is every time you're putting grounds around the pot is that you're acidifying the soil a bit.  
Keep in mind that there are folks on here who have more years of experience gardening than I've been alive.

used coffee grounds have a relatively neutral pH of around 6.5 after coming out of the auto drip coffee maker. https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm <~~~ click

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Re: Question about use of coffee grounds

Post  ChasingAnnie on 6/13/2017, 11:00 am

They've tested pH on grounds and found they have very little effect on pH. I get grounds from Starbucks frequently and I add them to my compost (thought of as a green/Nitrogen), I mix it before planting (quick Nitrogen release with a slow Phosphorus and Potassium release), sometimes make tea out of it, and I also use it as mulch for those dreaded slugs. If you YouTube "one yard revolution slug wars" he has a very interesting video on an experiment he made. I love using free sources in my garden.

Best of luck!


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Question about use of coffee grounds

Post  amcon2 on 6/13/2017, 11:12 am

Thanks for the responses.  I did not know that used grounds would have little effect on the ph. You can always learn something new here! I'm going to continue sprinkling those grounds without worry.
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Re: Question about use of coffee grounds

Post  countrynaturals on 6/13/2017, 11:36 am

@amcon2 wrote:I put coffee grounds in my compost pile but also add it around my tomato plants.  We drink a lot of coffee Shocked so there is always grounds on hand. Is there such a thing as adding too much around the plants that it would have a negative effect?
Do you have roses, azaleas, gardenias, blueberries, redwoods, magnolias, rhodies, hydrangeas? They all love coffee, too.  Very Happy
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