How to Fix Slimy Compost & Stop It From Turning to Sludge

Updated on November 16, 2016
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Why Composting Is Good

When organic waste like vegetable peelings and food leftovers are put in to general waste and are sent to landfill they do not properly biodegrade and create gases which are harmful to the planet. Some authorities charge for waste collect by weight so anything you can do to reduce the amount of stuff you throw away will save you money, be good for the environment and provide you with good quality free compost for the garden or indoor plants.

Home composting reduces the amount of waste going to landfill, stops your kitchen bin from smelling and creates some of the best and most nutritious material to use in your home & garden. Home made compost is far more rich in nutrients than the 'compost' which is sold at garden centers.

An example of what you can put in your compost from the kitchen
An example of what you can put in your compost from the kitchen

The Art Of Composting

Making good compost from kitchen and garden waste does take some practise and many people find they end up with a slimy, smelling sludge. This is usually due to the mixture being too wet as most organic waste has a high water content. A lack of air can also create a poor compost which is why you should add scrunched up newspaper and dry twigs/sticks and to avoid the compost becoming too compacted.

When composting we have green and brown waste.

Green waste is vegetable peelings, tea bags, coffee grindings, food leftovers, egg shells, old flowers, fresh grass clippings & plant waste.

Brown waste is paper, cardboard, dry leaves, dry grass clippings and twigs/sticks.

The ideal mixture should be moist but not wet and have an earthy odor. If it is too wet you should add more dry 'brown' material and use a garden fork to mix it up regularly and to make sure it is not too compacted.

Here I have added dry garden waste from purning and torn up cardboard which I will then mix in with a garden fork.
Here I have added dry garden waste from purning and torn up cardboard which I will then mix in with a garden fork.

Wet vs. Dry

The problem most people have is that their compost is too wet and it becomes very slimy, light coloured and smells a bit like excrement. You can see from the picture that mine is getting better and turning much darker but I still need to add some dry twigs and torn up cardboard and mix it in with a garden fork. If the weather is good and rain is unlikely I leave the lid off for a day or two until it drys out a bit.

If your compost is too dry then it will not start to rot down properly, you can add a little water to increase the moisture level, some people suggest urine which helps to get the process started! I enjoy gardening but am not that hardcore and I'm sure my neighbours wouldn't be too happy to witness this practise while entertaining guests and their children in the adjacent gardens!

Dry / Brown Material

After a session of garden maintenance I put the majority of what I have cleared into a pile where it can dry naturally in the sun and provides a good source of dry brown material. Anything including branches, twigs, leaves and grass cuttings will work. Old cardboard (brown only without any print) and old newspapers are also an excellent source of dry material. It should be noted that some weeds, especially invasive varieties such as Japanese Knotweed should never be put into a compost pile as they will continue growing and spread. They should either be burned or bagged up and taken to the dump.

Good Looking Compost!

Here you can see the compost is working well, still a little wet and with some eggshells and sticks which have not rotted down yet but they take the most amount of time to decompose, but most of the material has turned to compost. In a few months it should be ready to use. The compost should be turned regularly with a garden fork to mix it up, this will prevent it from becoming too compacted in places and allow air to move around and will also encourage worms.

When using a compost bin with a lid it is called 'hot' composting and this means the mixture will actually get warm and you can see steam rising from it on cold days, this is an indication the process is working well.

Compost Poll!

Is Your Compost Too Wet or Too Dry?

See results

What Not To Put In Your Compost

Meat (including bones) and dairy waste should not be put into your compost (except egg shells) as it can attract pests and harmful bacteria may remain which can be dangerous if you are using the compost to grow fruit and vegetables.

It is also recommended that you do not put anything in your compost which is high in citric acid such as lemons and limes. Animal waste and the contents of 'litter trays' should not be added and large amounts of oils, fats or grease should be kept out of your compost bin/pile too.

Obviously any non organic material should not be added such as plastic, painted or varnished wood, metal or chemicals.


How To 'Turn' Compost

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