All Things Gardening forum→Coffee Grounds

Views: 488, Replies: 14 » Jump to the end
Seattle, WA (Zone 8b)
NewbieGardner
May 16, 2020 12:46 AM CST
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


Name: Dr. Demento Jr.
Minnesota (Zone 3b)
RpR
May 16, 2020 3:22 PM CST
Coffee grounds help make good rich soil but do little to nothing to a soils PH.
Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Dahlias Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014
Celebrating Gardening: 2015 Plant Identifier Million Pollinator Garden Challenge
Image
pirl
May 16, 2020 3:27 PM CST
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

Name: SoCal
Orange County (Zone 10a)
Lazy Gardener or Melonator
Image
SoCalGardenNut
May 16, 2020 8:19 PM CST
I used to get free coffee ground from Starbucks, I put them on my tomato plants.
2022 wishlist: Pastelorama, Pastelegance, and Blonde Vision.
Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Dahlias Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014
Celebrating Gardening: 2015 Plant Identifier Million Pollinator Garden Challenge
Image
pirl
May 16, 2020 8:28 PM CST
Good idea. Always mix them into the soil or they can form a crust preventing effective watering.
Name: Frenchy
Falls Church, VA (Zone 7b)
Container Gardener Tender Perennials Dog Lover Houseplants Million Pollinator Garden Challenge Tomato Heads
Hostas Tropicals Annuals Foliage Fan Aroids Cactus and Succulents
Image
Frenchy21
May 16, 2020 8:52 PM CST
What exactly are the benefits of coffee grounds mixed into soil?
Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Dahlias Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014
Celebrating Gardening: 2015 Plant Identifier Million Pollinator Garden Challenge
Image
pirl
May 17, 2020 7:54 AM CST
They improve the tilth of the soil.
https://www.britannica.com/sci...
Name: Frenchy
Falls Church, VA (Zone 7b)
Container Gardener Tender Perennials Dog Lover Houseplants Million Pollinator Garden Challenge Tomato Heads
Hostas Tropicals Annuals Foliage Fan Aroids Cactus and Succulents
Image
Frenchy21
May 17, 2020 11:12 AM CST
Thank you Arlene. I read more about coffee grounds and how they actually affect the soil. Smiling
Name: Kimmy
Portland, Oregon (Zone 8b)
Image
Kimmy2012
Mar 26, 2021 2:24 AM CST
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?


Name: Gina
Florida (Zone 9a)
Tropical plant collector 35 years
Region: Florida Tropicals Aroids
Image
Gina1960
Mar 26, 2021 6:36 AM CST
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!
Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Dahlias Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014
Celebrating Gardening: 2015 Plant Identifier Million Pollinator Garden Challenge
Image
pirl
Mar 26, 2021 6:58 AM CST
@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.
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener or Melonator
Image
SoCalGardenNut
Mar 26, 2021 8:24 AM CST
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.
2022 wishlist: Pastelorama, Pastelegance, and Blonde Vision.
Name: Keith
Syracuse, NY (Zone 5b)
Bee Lover
Image
kclson
Apr 15, 2021 5:50 PM CST
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

Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Dahlias Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014
Celebrating Gardening: 2015 Plant Identifier Million Pollinator Garden Challenge
Image
pirl
Apr 15, 2021 8:34 PM CST
Soil acidifier will do much more for your blueberry than coffee grounds.
Name: UrbanWild
Kentucky (Zone 6b)
Kentucky - borderline of 6a & 6b
Lover of wildlife (Black bear badge) Critters Allowed Native Plants and Wildflowers Miniature Gardening Organic Gardener Frogs and Toads
Dog Lover Birds Vegetable Grower Spiders! Hummingbirder Butterflies
Image
UrbanWild
Apr 16, 2021 6:21 AM CST
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

« Garden.org Homepage
« Back to the top
« Forums List
« All Things Gardening forum
You must first create a username and login before you can reply to this thread.

Member Login:

[ Join now ]

Today's site banner is by dirtdorphins and is called "bleeding heart"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.