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Soil Amendments

Q.Heather Rhodes Article On Coffee Grounds

Zone Mojave Desert - gardening zone 9 Las Vegas | Anonymous added on July 24, 2021 | Answered

I live in Las Vegas where the pH of the soil is 8.0 – 8.4. Heather Rhodes says in her article “Many people feel that coffee grounds lower the pH (or raise the acid level) of soil, which is good for acid-loving plants. But this is only true for unwashed coffee grounds. “Fresh coffee grounds are acidic. Used coffee grounds are neutral.” If you rinse your used coffee grounds, they will have a near-neutral pH of 6.5 and will not affect the acid levels of the soil. What regions and soil types are Heather speaking about in this article? Surely, 8.4 is effected by 6.5 pH. Yes? Thank you. Laura Glismann Read more at Gardening Know How: Composting With Coffee Grounds – Used Coffee Grounds For Gardening https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm

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Certified GKH Gardening Expert
Answered on August 13, 2021

Yes, if your soil is that alkaline, then washed coffee grounds would, slowly, affect that pH. However, if you would like to lower that pH quicker- I would leave them unbrewed or rinsed. If you want better control, then I would opt for a product such as superphosphoric acid for that.

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