Avatar for NewbieGardner
May 16, 2020 12:46 AM CST
Seattle, WA (Zone 8b)
I got to know coffee grounds are added to the soil to make it acidic. So started using it for my blueberry plant.

What plants should I avoid coffee grounds even if that plant requires acidic soil
Avatar for RpR
May 16, 2020 3:22 PM CST
Name: Dr. Demento Jr.
Minnesota (Zone 3b)
Coffee grounds help make good rich soil but do little to nothing to a soils PH.
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May 16, 2020 3:27 PM CST
Name: Arlene
Southold, Long Island, NY (Zone 7a)
Region: Ukraine Dahlias I was one of the first 300 contributors to the plant database! Houseplants Tomato Heads Garden Ideas: Level 1
Plant Identifier Photo Contest Winner: 2014 Million Pollinator Garden Challenge Celebrating Gardening: 2015
Once they are ground and cooked they are neutral - neither alkaline nor acid. They are good mixed into the soil. Here are several testers inserted into pure coffee grounds: Thumb of 2020-05-16/pirl/058961
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May 16, 2020 8:19 PM CST
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener or Melonator
I used to get free coffee ground from Starbucks, I put them on my tomato plants.
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May 16, 2020 8:28 PM CST
Name: Arlene
Southold, Long Island, NY (Zone 7a)
Region: Ukraine Dahlias I was one of the first 300 contributors to the plant database! Houseplants Tomato Heads Garden Ideas: Level 1
Plant Identifier Photo Contest Winner: 2014 Million Pollinator Garden Challenge Celebrating Gardening: 2015
Good idea. Always mix them into the soil or they can form a crust preventing effective watering.
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May 16, 2020 8:52 PM CST
Name: Frenchy
Falls Church, VA (Zone 7b)
Region: Ukraine Tender Perennials Container Gardener Dog Lover Houseplants Million Pollinator Garden Challenge
Tomato Heads Hostas Tropicals Annuals Foliage Fan Aroids
What exactly are the benefits of coffee grounds mixed into soil?
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May 17, 2020 7:54 AM CST
Name: Arlene
Southold, Long Island, NY (Zone 7a)
Region: Ukraine Dahlias I was one of the first 300 contributors to the plant database! Houseplants Tomato Heads Garden Ideas: Level 1
Plant Identifier Photo Contest Winner: 2014 Million Pollinator Garden Challenge Celebrating Gardening: 2015
They improve the tilth of the soil.
https://www.britannica.com/sci...
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May 17, 2020 11:12 AM CST
Name: Frenchy
Falls Church, VA (Zone 7b)
Region: Ukraine Tender Perennials Container Gardener Dog Lover Houseplants Million Pollinator Garden Challenge
Tomato Heads Hostas Tropicals Annuals Foliage Fan Aroids
Thank you Arlene. I read more about coffee grounds and how they actually affect the soil. Smiling
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Mar 26, 2021 2:24 AM CST
Name: Kimmy
Portland, Oregon (Zone 8b)
SoCalGardenNut said:I used to get free coffee ground from Starbucks, I put them on my tomato plants.


I went to Starbucks several times and they never had any used coffee ground. The manager always said "come back later, we may have some in the afternoon." I always came back 3 or 4 hours later (around 6 p.m.) and they still didn't have any.

Do you have any idea when they dump their used coffee ground?
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Mar 26, 2021 6:36 AM CST
Name: Gina
Florida (Zone 9a)
Tropical plant collector 38 years
Aroids Region: Florida Tropicals
Years ago there was a guy on a Palm forum I belong to who was experimenting using coffee grounds as a pesticide/prevention for scale on palms. He had done a lot of research on it and said that coffee contains over a 100 components that no one is exactly sure what they do. But he did have some success with it
Award winning beaded art at ceinwin.deviantart.com!
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Mar 26, 2021 6:58 AM CST
Name: Arlene
Southold, Long Island, NY (Zone 7a)
Region: Ukraine Dahlias I was one of the first 300 contributors to the plant database! Houseplants Tomato Heads Garden Ideas: Level 1
Plant Identifier Photo Contest Winner: 2014 Million Pollinator Garden Challenge Celebrating Gardening: 2015
@Kimmy2012 - my guess is they have a deal somewhere and you'll never get grounds from them. You may want to try a local coffee shop.
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Mar 26, 2021 8:24 AM CST
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener or Melonator
Kimmy2012 said:

I went to Starbucks several times and they never had any used coffee ground. The manager always said "come back later, we may have some in the afternoon." I always came back 3 or 4 hours later (around 6 p.m.) and they still didn't have any.

Do you have any idea when they dump their used coffee ground?




I did this about 10-15 years ago, not sure what they do now.
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Apr 15, 2021 5:50 PM CST
Name: Keith
Syracuse, NY (Zone 5b)
Bee Lover
I use coffee grounds on my blueberry bed but I also use a Soil Acidifier and bone meal fertilizer.
I can't remember the name of the acidification but it's in the picture attached. I haven't had much luck with the PH analyses like the one that you stick in the soil like Pirl above, but his looks more sophisticated than the ones that I've tried. I bought a soil test kit two years ago, but that's difficult to use too.
Thumb of 2021-04-15/kclson/f666a8
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Apr 15, 2021 8:34 PM CST
Name: Arlene
Southold, Long Island, NY (Zone 7a)
Region: Ukraine Dahlias I was one of the first 300 contributors to the plant database! Houseplants Tomato Heads Garden Ideas: Level 1
Plant Identifier Photo Contest Winner: 2014 Million Pollinator Garden Challenge Celebrating Gardening: 2015
Soil acidifier will do much more for your blueberry than coffee grounds.
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Apr 16, 2021 6:21 AM CST
Name: UrbanWild
Kentucky (Zone 6b)
Kentucky - borderline of 6a & 6b
Million Pollinator Garden Challenge Birds Vegetable Grower Spiders! Organic Gardener Native Plants and Wildflowers
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Starbucks used to be a great place for used coffee grounds. Now it seems that they can't be bothered to save them. I've spoken to most in my area. Most of that group specifically told me they won't save them. The few that did, it wasn't much and made the stops like playing shot machines. They just said they were busy. I got lucky a few years with two. Staff changed and now they have dried up as well. My local coffee shops and doughnut places either won't save them, or have someone picking up all of what they save. So... I'm still looking. Good luck in your search.
Always looking for interesting plants for pollinators and food! Bonus points for highly, and pleasantly scented plants.

"Si hortum in bibliotheca habes, nihil deerit." [“If you have a garden and a library, you have everything you need.”] -- Marcus Tullius Cicero in Ad Familiares IX, 4, to Varro. 46 BCE
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