Making your own compost is not only a great way of recycling garden waste, it’s also the cheapest and one of the most effective ways of keeping your soil rich in nutrients and the plants in your garden fit and healthy.
For the best results when making compost you need to understand the ideas behind the process. Put simply, making compost is like making a cake – you need to have certain equipment, the right ingredients in the right amounts and water to mix it through thoroughly. The micro-organisms in the soil will then do all the hard work for you. The process of making a great compost can take anything from a few months to a year, depending on the materials you use, the time of year you start (the composting process is quicker in summer than in winter) and the sort of compost you want at the end.
How long before your diy compost is ready?
Compost started in the autumn can be ready for spring planting, but most people usually leave their compost heap for anywhere between 6 months to 2 years for the best results. Your compost will be ready to use when it has taken on a dark brown colour accompanied by a rich, earthy smell. Try rubbing some between your fingers too – it should feel like soil and easily crumble apart.
Step 1: Getting started
To start making your own compost you’ll need a bin to keep it in. Any large bin will do, but it’s more common now to use a composter – a large plastic bin with a lid that allows you to empty waste into it at the top and a sliding door at the bottom where you can retrieve the compost. Composters keep the material you put in them neat and tidy, and help retain moisture and heat that are vital to the composting process. They come in a variety of shapes and sizes to suit different sized gardens; around 200 litres will hold enough material to compost efficiently. Aim to fill your bin as quickly as possible, because the decomposition process won't really start until it’s full.
Make sure you put your composter somewhere that provides it with a bit of shade and protection from the elements as the composting process works best when temperatures are kept consistent. Where possible, it should also be positioned over an open earth base as this will allow moisture to drain away easily. However, if you have to place it on a hard surface you can simply add a layer of soil in the base.
Step 2: Making your compost
To get quick decomposition you need to have the right ingredients in the right proportions:
- A balanced collection of dry fibrous material (shredded prunings, newspapers or straw)
- wet green material (grass clippings, discarded bedding plants and weeds)
- organic kitchen waste such as old fruit and vegetables is perfect.
You can also add woody material such as trimmed branches from bushes and shrubs, but you will need to chop it finely before adding it to the compost bin otherwise it will take longer to decompose than the other ingredients. The easiest way to chop it up is with a garden shredder, but if you have the patience you can get the same results with a pair of secateurs.
Avoid putting these in your compost:
- Processed food products, meat and fish in your composter - these can attract vermin.
- Weed roots and seeds - they may spread around the garden when you eventually distribute the compost.
- Sawdust - it can contain toxins.
- Cardboard, glossy magazine paper and thick woody material - they take too long to decompose.
Step 3: Turning your compost
Although the waste materials can generally be left to their own devices once you’ve put them in your composter, it’s a good idea to turn the heap to help promote decomposition. This is an easy process whereby you simply turn over the material in the composter with a garden fork, aerator or similar tool. This prevents it from becoming too compacted or wet and helping to introduce more air which is necessary for decomposition to take place. Try to turn the compost around once every month or so for the best results.