Making homemade compost It is a practical, simple, and very rewarding activity for both adults and children. This process allows you to transform organic household waste into natural compost of the highest quality, enriching soils, gardens, orchards, and pots, while promoting values of sustainability and environmental care. Through an ancient practice, we can responsibly close the organic matter cycle, reduce our ecological footprint, and give a second life to waste that would normally end up in landfills.
What is compost and why make it at home?
La composed It is the result of a natural process of aerobic decomposition (with oxygen) in which microorganisms (bacteria, fungi, small invertebrates) transform organic remains into humus, a nutrient-rich substance with an earthy color and pleasant smell, very similar to forest soil. homemade compost Not only does it significantly reduce the amount of waste produced at home, but it also provides multiple benefits both at an environmental and personal level:
- Reduces environmental impact: Reduces the amount of waste in landfills and reduces emissions of methane, a potent greenhouse gas.
- Enriches the soil: Improves soil structure, aeration, water retention and fertility in gardens, orchards and pots.
- Promotes plant health: Provides key nutrients (nitrogen, potassium, phosphorus, micronutrients) that stimulate growth and prevent disease.
- Closes the cycle of matter: It allows us to recycle resources that would otherwise be wasted, returning to the earth what comes from it.
- Promotes sustainability values: It is an educational, participatory and pedagogical activity, ideal for families and schools.
Fundamental principles for making homemade compost
Before starting home composting, it is important to consider some essential foundations to ensure the success of the process:
- Waste separation: Correctly differentiate between usable organic waste (leftover fruit, vegetables, coffee, infusions, leaves, branches) and those that should be avoided (meats, fats, dairy products, processed foods, large bones, pet feces, chemicals).
- Proper proportion of materials: Alternate “green” (nitrogen-rich, moist) and “brown” (carbon-rich, dry) materials to maintain nutritional balance and prevent odors or rot.
- Ventilation: Ensure the supply of oxygen through adequate aeration to stimulate the action of aerobic microorganisms.
- Humidity and temperature: Maintain a humidity similar to a wrung-out sponge and avoid excess water or dryness, as well as promote warm temperatures to facilitate decomposition.
- Patience and observationThe process can take several weeks or months, depending on materials, climate and method.
Types of homemade compost: Which method should you choose?
There are different composting methods depending on the available materials, space, and level of involvement in process management. The main types are:
- Cold composting: This involves accumulating and slowly decomposing organic waste in a pile or container. It's the simplest system and requires less attention, although the process is slower.
- Hot composting: This involves creating piles with a balanced ratio of green and brown materials, with increased monitoring (mixing, humidity, and temperature control). It allows compost to be produced in less time (weeks to months).
- VermicompostUse worms (especially Eisenia foetida or the California red worm) to speed decomposition and enrich the compost. It's ideal for small spaces and kitchen waste.
What materials can you compost?
To make compost efficiently, it's essential to know which waste is suitable and which should be avoided. The key to composting is combining carbon-rich ("brown") materials with nitrogen-rich ("green") materials:
- Green materials (nitrogen):
- Fruit and vegetable remains
- Coffee grounds, tea bags
- Freshly cut grass, young weeds
- Chopped eggshells
- Fresh flowers or green plant remains
- Manure from herbivorous animals (rabbit, horse, cow)
- Brown materials (carbon):
- Dry leaves, small branches
- Straw, hay, untreated wood sawdust
- Paper without toxic inks, cardboard, napkins
- Nutshells, small fruit stones
- Wood ash (in small quantities)
- Wool, natural threads, feathers, hair
Avoid adding to the compost:
- Fish, meat, large bones, fat, oils
- Processed foods, sauces, dairy products, excess bread
- Large amounts of citrus, very rotten tomato
- Pet waste (dogs, cats)
- Cleaning products, insecticides, treated wood
Materials and tools needed for your compost
- A container or composter suitable for the available space (can be built with pallets, mesh, wood, bottles, buckets, drums or purchased). You can also learn how to make an enzyme solution to boost composting..
- Fertile soil for the first layers or when using a closed container.
- Cutting tools (scissors, knife, pruners) to break up waste and facilitate decomposition.
- Fork, shovel or long stick to stir and oxygenate the contents.
- Watering can or sprayer to control humidity.
- Tarpaulin or cover (depending on the method) to protect from excessive rain and prevent drying.
- Gardening gloves.
How to make homemade compost step by step
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Prepare the composter or container: Select or build a suitable container, such as a wooden box, bucket, wire mesh, pallet, drum, or bottle. If it's a closed container, make ventilation holes in the sides and bottom. For open-bottom containers, choose a location with direct contact with fertile soil.
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Place the first layers: At the base, add a layer of dry material (leaves, twigs, cardboard) to promote drainage and prevent waterlogging. Top with a layer of soil or mature compost (optional, to provide microorganisms).
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Add organic waste: Alternate layers of green and brown materials. The ideal ratio is 1 part green materials to 2 or 3 parts brown materials. Chop up large waste to speed up the process.
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Humidity control and ventilation: Keep the moisture similar to a wrung-out sponge. If it feels dry, add sprayed water; if it's too wet, add more dry material. Stir the mixture frequently (every week or every time you add waste) to oxygenate it and prevent unpleasant odors.
Compost bin options for different spaces
- Mesh composterIdeal for large gardens. The mesh facilitates airflow and access to soil microorganisms.
- Pallet composter: By recycling 4 or 5 pallets, a solid, airy structure with good volume is built for large quantities of waste.
- Wooden boxes or crates: Useful for small spaces, they allow for well-defined layers.
- Plastic bottlesFor apartments or balconies, a perforated 5-liter bottle serves as a compact and educational composter.
- Buckets and drums: A clean option for interiors as long as ventilation and humidity are controlled.
- Concrete blocks: If you have outdoor space, it offers durability and insulation.
- Wine barrels: Ideal for continuous cycles and larger-scale composting.
How do you know if your compost is in good condition?
- OdorHealthy compost smells like moist, fresh earth. If it smells rotten or ammonia-like, it needs aeration or more dry material.
- Color: Dark brown, uniform, without distinguishing the original residues.
- TextureLoose, lumpy, and free of excess moisture. Do the fist test: squeeze a little bit of compost; if it drips a lot, it's too moist; if it crumbles, it's dry; if it holds its shape without dripping, it's perfect.
Troubleshooting and practical tips
- Unpleasant smellThis could be due to excess moisture, lack of oxygen, or too much green material. Add dry material and stir well.
- Presence of flies or mosquitoes: Cover fresh waste with a layer of dry leaves or cardboard, and avoid adding cooked food.
- Too much drynessSpray with water and add fresh waste. Keep the compost in the shade to prevent it from drying out.
- Takes time to decompose: Chop the waste further, check the brown/green ratio, and increase the turning.
Benefits of using compost in your home and garden
- Natural fertility: Provides essential nutrients (NPK) without the need for chemical fertilizers.
- Improves soil structure and texture: Promotes aerated soils, retains water, drains better and reduces compaction.
- Healthy root development and vigorous plants: Stimulates growth and production of fruits and flowers.
- Biologic controlHealthy humus acts as a natural bactericide and fungicide, reducing diseases.
School compost and its importance in environmental education
Conducting composting projects at school is an excellent way to encourage children and young people to reflect on their environmental footprint, waste management, and natural cycles. Setting up a small compost bin in pots or boxes with the right materials promotes practical learning, ecological awareness, and responsible habits from an early age.
Extra steps to speed up and improve your compost
- Crush or finely chop the waste before adding it..
- Turn the pile or container regularly to aerate and accelerate decomposition.
- Add worms to create vermicompost if you want to speed up the process and obtain top-quality humus.
Frequently Asked Questions About Homemade Compost
- How long does it take for compost to be ready? Between 3 and 6 months, depending on the method, care, temperature and type of waste.
- Can you compost in your apartment? Yes, using small composters, buckets, bottles, or vermicomposters, and ensuring ventilation and humidity.
- What do I do if fungus appears? They're normal in small amounts and help with decomposition, but they shouldn't cover the entire mixture. Stir and adjust the humidity if they appear excessive.
Alternatives for those who cannot make homemade compost
If for some reason your compost hasn't turned out as expected, there are specialized commercial composters, both indoor and outdoor. Additionally, some cities have organic waste collection programs or community composting centers where you can take your waste.
Environmental and social impact of home composting
Composting at home is much more than a technical process, it is an action transformative ecologicalAccording to various studies, at least half of household waste could be composted, reducing pressure on landfills and helping to mitigate climate change. It also represents a small, everyday revolution: involving families, neighborhoods, and schools in the organic waste cycle can be the starting point for other sustainable habits, such as the use of urban gardens, organic farming, and reducing plastic and chemical consumption.
The composting process is as old as agriculture itself, and by adopting it at home, we not only care for our plants and gardens, but we also actively contribute to building a healthier and more resilient environment in the face of current environmental challenges.
Starting to compost at home may seem like a small gesture, but it multiplies its benefits on a personal, community, and environmental level. Turning waste into compost and returning it to the soil is a way to honor the cycle of life and embrace a more conscious and responsible lifestyle for our planet.