Knowledge Builders

can you vermicompost coffee grounds

by Federico Jenkins Published 5 months ago Updated 1 week ago

Worms Like Coffee Grounds
In a vermicomposting bin, the coffee grounds make a tasty addition to other kitchen scraps such as fruit and vegetable waste, leftover pasta or oatmeal. Worms need some gritty foods to help their gizzards with digestion, which is where coffee grounds really shine in the vermicomposting bin.

Can vermicomposting worms eat coffee?

Your vermicomposting worms will be able to eat these since these are still recyclable matter. It’s definitely safe for your worms to eat (if humans can, why can’t they, right?). So don’t be afraid to feed your worms with some Coffee grounds. It will definitely be a good addition to their diet.

Can You compost coffee grounds?

If you are adding coffee grounds to your traditional compost pile or compost tumbler, it is important to treat them as green compost material; they are about 2% nitrogen by volume. The coffee grounds will need to be balanced with sufficient brown compost material such as leaves, or shredded paper.

Do coffee grounds attract worms to plants?

Worms love coffee grounds, so they are a good way of attracting them into your soil or compost pile. While some people will swear that you can stop slugs and ants getting to your plants by sprinkling coffee grounds around them, there is no real evidence to suggest this is true.

Can You compost worm bedding with coffee?

Now, if things get out of hand, and the worm bedding itself gets too acidic, then you can always put in some crushed eggshells to help neutralize the system. Since compost worms also eat their bedding, you can still supplement them with some coffee (in its liquid form) when you pour some on top of it.


Can I put coffee grounds in my worm farm?

Coffee grounds have about the same amount of nitrogen as grass clippings – 2% or so, meaning they heat up quickly when added to compost and help turn the entire pile into a beautiful dark rich soil. They are also very suitable for the worm farm, with those little guys loving used coffee grounds.

Are coffee grounds harmful to worms?

It's definitely safe for your worms to eat (if humans can, why can't they, right?). So don't be afraid to feed your worms with some Coffee grounds. It will definitely be a good addition to their diet.

Can earthworms eat coffee grounds?

Soil-borne bacteria and fungi break down the various chemical components of coffee grounds after several months. Earthworms are also able to use this food source. Earthworms consume coffee grounds and deposit them deep in soil. This may account for noted improvements in soil structure such as increased aggregation.

Do earthworms like eggshells?

eggshells - worms simply can't eat them. They will still be there when you remove the worm castings, and you'll have eggshells in the garden. Eggshells are good for the garden, so if you crush them up, and put them in the worm farm, they'll end up adding calcium to your soil.

What does caffeine do to worms?

Caffeine increased worm's lifespan in lower concentrations while it exhibited an opposite effect at higher concentrations. These results suggest that caffeine has a dual role on worm's lifespan and may point to a toxic effect at higher concentrations. Exposure to caffeine increases lifespan of wild-type worms.

What can I use for grit in my worm bin?

Worms have a gizzard like chickens so fine grit should be added to help the worms digest food. This gritty material includes cornmeal, coffee grounds and/or finely crushed egg shells (dry the shells and then crush). Avoid large amounts of fat, meat scraps or bone.

Do worms eat coffee filters?

Worms love them! Coffee filters are also fine. Use a spoon to scoop out K-cups. However, coffee grounds are acidic.

Do worms like banana peels?

Banana peels are fantastic food for composting worms including red wigglers. You can feed the worms the banana peel, the banana flesh or even old skins that have gone brown. Worms are not picky about the banana you feed them but they will break down older bananas and peels quicker.

Coffee Ground Basics

When we refer to coffee grounds, we are talking about the ground-up coffee beans left over when you have made coffee in a French press, filter coffee machine, or espresso maker.

Can You Compost Coffee Grounds?

Yes, you can compost coffee grounds and they are a great addition to your compost. They contain nutrients, organic material, and they attract worms. In fact, there is no reason not to add them!

Coffee Grounds in Soil

As previously mentioned, you can add coffee grinds directly to your soil. This fact is not limited to the soil in your yard, and you can also sprinkle coffee grinds into the soil of houseplants.

Coffee Grounds as Fertilizer

Coffee grounds make an excellent slow-release fertilizer if you sprinkle small amounts on your soil. However, the best way to utilize them as a fertilizer is to add them to your composter.

Can You Compost Coffee Filters?

Yes, paper coffee filters can be composted along with the coffee grounds. There is no need to separate these when adding them.

Can You Compost Coffee Pods?

Most coffee pods are made of aluminum or plastic, therefore they are not compostable.

Composting Coffee Ground Final Thoughts

Coffee grounds make a great addition to your compost pile. They provide a nice texture and color to your compost, while their nutrient content makes them a valuable part of your compost. You can also use coffee grounds to create a barrier against pests.

Composting Coffee Grounds

Composting with coffee is a great way to make use of something that would otherwise end up taking up space in a landfill. Composting coffee grounds helps to add nitrogen to your compost pile.

Coffee Grounds as Fertilizer

Used coffee grounds for gardening does not end with compost. Many people choose to place coffee grounds straight onto the soil and use it as a fertilizer. The thing to keep in mind is while coffee grounds add nitrogen to your compost, they will not immediately add nitrogen to your soil.

Using Fresh Coffee Grounds

We get lots of questions about using fresh coffee grounds in the garden. While it’s not always recommended, it shouldn’t be a problem in some situations.

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