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using coffee grounds in worm farms

September 17, 2012 in Blog


I was surprised to see comments regarding coffee grounds being unfavourable to worms. I had always thought worms loved coffee grounds. Upon further investigation, most literature also supports this theory including Lynn Bagnall’s ‘Easy Organic Gardening.’ The key would be making sure they are kept moist , aren’t still holding heat, and are incorporated with other worm food materials. Some individuals online have also carried out experiments to support this theory of worms loving coffee grounds (provided they are kept moist).

Just wondering what the feedback was from the workshop and why we shouldn’t feed worms coffee grounds?

8 comments to 'using coffee grounds in worm farms'

  1. Mmm, I’ve been wondering about this too. My worms have had some coffee grounds occasionally (from our plunger) with other kitchen scraps and have seemed to be fine. Recently I got a bucket of coffee grounds from a coffee shop and my two worm farms got half a bucket each. Maybe that was a bit much! I removed what I could and gave it to the compost bins.

  2. Sounds like you have quite a setup @Anna21, two worm farms and multiple compost bns!

  3. I think they can be a bit acidic & oily. I’ve put some in with my worms (mixed in with other stuff), but wouldn’t put too much. I put some around my citrus (loves acid soils) and the rest in the compost. I think you can use them as a snail/slug barrier as well, but I’ve not tried it so I don’t know how useful it will be.
    Worms love bananas!

  4. I have also used the coffee grounds for my camellias including my tea plant which is also a camellia. Hope to use it for making tea one day.

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