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Coffee Ground Vermicomposters


Coffee Ground Vermicomposters

All those who feel like adding coffee grounds to their worm bins or who collect and make use of Coffee Grounds are welcome here.


Lets share ideas.

Location: Decomposing ready for some worm munching
Members: 155
Latest Activity: Oct 6, 2015

Discussion Forum

How do you manage coffee grounds? 7 Replies

This question is for you who use larger volumes of grounds.How do you handle and store and apply coffee grounds?I pick up from Starbucks every time I am near one, and 3 stores are in my stomping…Continue

Started by Daniel J Kline. Last reply by Daniel J Kline Aug 13, 2014.

Coffee grounds from where 12 Replies

Hello all.  I get  a few gallons (3-5) per week from the various coffee pots and cafeteria at my office.  I occasionally add a bucket of grounds to the worm bin and the worms seem to love it but only…Continue

Started by Joseph Eggers. Last reply by Thomas Vincent Feb 5, 2014.

UCG and Veg. 23 Replies

 So my idea on food for my new worm box is to mix coffee grounds with organic produce. since this is going to be an inside thing i am wanting to let them age anearobically (ie. putting them in a…Continue

Started by Christopher B.. Last reply by Patrick G. Perry Jan 11, 2014.

excited to see a coffee ground group! 4 Replies

Hi all. I am in the research stages and trying to decide which type of bin I want to start with but have been using coffee grounds with worms since 1970. I used to sell worms to people for fishing. I…Continue

Started by Mary Thompson. Last reply by Mary Thompson Jan 1, 2014.

Comment Wall

Comment by Paula Allen on March 7, 2011 at 8:24pm
I have only added maybe a cup of coffee grounds every few weeks to my worm bins.  The rest of the coffee grounds I place in my non worm compost bin. 
Comment by Sam Jones on March 7, 2011 at 8:52pm

Thanks for joining the group. Is your non worm bin, a hot composting system?

I have done this with lots of my coffee grounds over this winter.

Some worms got in there anyway because its warmer than the frozen ground around. Guess they will make themselves at home in these larger compost heaps I have once the spring gets in motion. The leaves in the bin will have decomposed more and there will be lots of microbes in there for them to feed on.

Comment by Paula Allen on March 7, 2011 at 9:11pm
Hi Sam yes I have 4 hot composting trash can composting systems.  That is how I got started in composting.  Then I saw a video on how to set up a worm bin.  Bentley The Compost Guy Christy.  Since my worm systems are on the smaller side I don't want to over whelm them with to much coffee grounds.  So I toss them in the out side cans.  Which I hope helps the thaw out soon.  :-)
Comment by Sam Jones on March 7, 2011 at 9:30pm

Looks like a neat product.

Comment by Paula Allen on March 9, 2011 at 5:21am
Once I have enough Red Wigglers (can you ever have enough)  I want to try cardboard and powdered egg shells and coffee grounds.  I have some 3 gallon buckcets I can drill some holes in.  I will cover the bedding with more shredded brown paper bags.  Use lawn fabric for the lid and secure it with a hair net the extra fine kind or a shower cap with some holes punced in this will give more air.  I worry about the coffee grounds heating up though.
Comment by Sam Jones on March 9, 2011 at 5:46am
Paula that sounds good. I think Red Worm Bentley did a similar experiment with mixed results. Seems like its important to let the grounds sit for a while and possibly mixed them with some leaf matter from below a tree or some of your completed vermicompost and give it a good stir and then let the worms move in when they are ready. I think outdoor windrows might work well. So that you don't just pile it up on top of the previous batch but leave each batch some space to allow the fungus and other microbes to get at it for a while and then the worms will move in. This is exactly what happened with my outdoor pile last year and the worms were thriving in there. I had an old pile of compost leaves from 2009 Autumn which were at the bottom of the pile and already had some worms in and I kept mixing some of this stuff with the new grounds that I added.
Comment by Paula Allen on March 9, 2011 at 5:58am
Sam doing it out side does seem like a better ideal.  I have a bucket full of used grounds.  I think I will spread them out on a flat box I can get from work layered with some foil.  Mixe some leaves with it like you suggested. 
Comment by Lee Jolliffe on March 10, 2011 at 1:22am

My college kids told me about a coffee shop that bags up used coffee grounds, filters, etc, for composters. Here's the email I sent to Bentley a week or so ago, when he mentioned he's getting ready to try it:


So, Bentley, I've been using a local coffee-shop's grounds for about a year now, and yes, it's a touchy addition to a worm bin!  The first time, the coffee grounds looked so much like soil that I over-added them. Whew! My worms made a huge run for it, because the bin got 'way too hot. I put in loads of leaves and remixed everything, and that cooled it down again. Still, the worms in that bin were noticeably smaller than in my other bins. So I cut back heavily on using the coffee grounds indoors or in my red-worm bins at all, and put them in my HUGE outdoor leaf pile (all my neighbors "donate" to save the $7.50 a BAG our city charges for taking away our leaves) OR sometimes I spread them thinly all over my garden beds, which combines them with the leaves already there as mulch, and provides the local worms a little something to eat.

This January we had a thaw and I got crazy, took all the coffee shop's grounds (they had scads because no one was taking them in winter), and used some of them thinly in a new indoor worm bin. And again, everybody wanted to escape. This time it wasn't that the bin got too hot, but that the coffee grounds weren't very wet or "used" (at least some of them) and they were sharp like sand. At least, that's what I concluded when I dug into the bin. I could feel the scratchy coffee through my thin latex gloves! So I added a little more water to the coffee grounds, and put more leaves in the bin. The worms settled back down and are happily eating and making cocoons again.


I put the rest of the huge haul of coffee grounds into my outdoor mega-leaf heap.

Comment by Paula Allen on March 10, 2011 at 7:35am

At work they make tea with loose leaf tea leaves just pour them in a filter like coffee grounds.  Are  tea leaves a little safer then coffee grounds?  I put a big handfull in my bins.  I have only noticed many baby worms under it so far.  I mixed some spent tea and strawberry caps in a bucket along with some leaves from my bags to see what happens.   

Comment by Paula Allen on March 10, 2011 at 7:38am

I did notice when I added coffee grounds to my out door NWB's that it absorbed some of the smell.  It never got bad smelling since I always had lots of shredded dry materials on tope. 


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