Home vermicomposting It is presented as an ecological, economical, and extremely efficient alternative for the management, recycling, and recovery of organic waste in small spaces, such as apartments, balconies, terraces, and small patios. Although many people think they need large areas to compost, thanks to vermicomposting, it is possible to transform the most abundant fraction of our waste (up to 40-50% of the total household waste) into earthworm humus, a high-quality natural fertilizer, handling quantities of waste adapted to our daily lives and without the nuisance of odors or insects.
What is vermicomposting and how does it work?
Vermicomposting consiste en la controlled biooxidation of organic matter, mainly through the action of red worms (Eisenia fetida) and other decomposing microorganisms. The deposited organic matter (fruits, vegetables, wet cardboard, coffee grounds, etc.) is digested and transformed into stable humus, without causing temperature increases or unpleasant odors, thanks to the aerobic activity of the worms and the proper structure of the substrate. The presence of worms not only speeds up the process but also improves the quality of the final compost, providing essential nutrients, improving soil structure, and increasing water retention and aeration.
Advantages of vermicomposting in small spaces
El domestic vermicomposting It is especially suitable for small spaces for several reasons:
- Takes up little space: Home vermicomposters are usually compact, stackable, and easily adaptable to any corner of the home, even indoors.
- It does not generate bad odors: If done correctly, the process is clean and odor-free, and can be installed in kitchens, balconies, or terraces without any problems.
- You will reduce the volume of waste: More than 40% of household waste can be recycled this way.
- You get organic fertilizer and leachate: The resulting humus and liquid fertilizer enrich flowerpots, urban gardens, ornamental plants, and gardens.
- Environmental contribution: Recycling at home reduces your carbon footprint, reduces the use of chemical fertilizers, and minimizes waste management and transportation.
Optimal materials and conditions for home vermicomposting
To start vermicomposting at home you need:
- Vermicomposter: This is the container where the process takes place. It can be purchased or homemade using stackable plastic, wood, or polystyrene boxes. It should have perforated trays or tiers and a lower tray to collect leachate.
- Initial substrate: Coconut fiber, mature compost, or a mixture of aerated soil with some pre-fermented manure is recommended.
- Californian red worm: Eisenia fetida is the most efficient species thanks to its voracity, adaptability, and high reproductive rate. It is recognized by its reddish color and size, ranging from 5 to 9 cm.
- Domestic organic waste: Fruit and vegetable peels and scraps, coffee grounds, crushed eggshells, cardboard and paper without plastic inks, tea bags, hair, and small amounts of grass.
The ideal conditions for worms they are:
- Constant humidity (70-80%); keep the substrate moist but never waterlogged.
- Total absence of direct light: Protect the worm composter from the sun and strong artificial light; worms avoid light.
- Stable temperature between 15 and 25ºC: Although they can survive between 4 and 30ºC, they grow and reproduce best in the optimal range.
- Neutral or slightly alkaline pH: Avoid highly acidic residues such as large amounts of citrus fruits or vinegar.
What can and can't you compost?
Recommended waste:
- Fruit and vegetable scraps (raw), peels, skins and finely ground.
- Leftover tea, infusions and coffee (with paper filters included).
- Cardboard and paper without plastic inks, always moistened and shredded.
- Well crushed eggshells (provide calcium).
- Small pieces of grass, green leaves and hair.
Avoid adding:
- Large amounts of citrus fruits, onions, spices or excessively acidic foods.
- Bones, meat, fish or foods of animal origin (they attract pests and generate bad odors).
- Cheeses, dairy products, sauces and very fatty foods.
- Laminated or glossy paper, pine needles, and plants treated with toxic products.
- Walnut, chestnut or willow leaves for their allelopathic compounds.
Remember: The more varied the food, the better the result and the more balanced the hummus generated will be.
Care, troubleshooting, and practical tips
- Lack of moisture: If the substrate is dry or ants appear, water gently in a fine mist and avoid excess dry material.
- Excess moisture/Compaction: If you notice that the substrate becomes compacted, smells bad, or the worms are rising to the surface, aerate the substrate, add dry cardboard, and reduce watering.
- Bad smells: Remove decomposing remains, air them out, and provide dry materials such as paper and cardboard.
- Fruit flies: Always cover fresh leftovers with a layer of paper, cardboard or fiber to prevent them from appearing.
- Mini insects and small spiders: They don't pose a problem; they're part of the vermicomposter's ecosystem.
- Holidays: Leave some food, check the humidity, and cover the substrate with a damp cloth. If you're away for a long time, a bottle with small holes can retain moisture.
Production and use of vermicompost
Under domestic conditions, every 20 kg of organic waste can generate between 6 and 10 kg of earthworm humus In about 4-5 months, depending on the number of worms, the type of food, and humidity and temperature management. The final material will be a dark, earthy-scented, loose-textured compost, ideal for urban gardens, container gardens, ornamental plants, and seedbeds. The collected leachate is excellent as a liquid fertilizer, always diluted in water before applying.
Vermicompost It will enrich your soil, improve its structure and fertility, and facilitate water retention. It also promotes soil biodiversity and helps reduce the purchase of chemical fertilizers, generating financial savings and improving the health of your crops. All this, from the comfort of your home and with a positive environmental impact, facilitating the transition to a more sustainable life.