Vermicomposting is an eco-friendly method for recycling organic waste, improving soil fertility, and boosting plant health. Photo by UF/IFAS.
In a world increasingly focused on sustainability, vermicomposting has quietly emerged as a simple, eco-friendly method to reduce waste and enhance garden soil health. This natural process involves specialized earthworms that convert kitchen and garden waste into nutrient-rich vermicompost, often dubbed “black gold.”
Beyond the environmental benefits, vermicomposting brings tangible advantages to your garden. When integrated into your garden soil, vermicompost enhances soil structure, improving water retention and reducing soil compaction. Moreover, it serves as a slow-release fertilizer, converting nutrients into readily available forms for plant roots. Vermicompost also enriches your soil ecosystem by introducing beneficial microorganisms that help suppress soil-borne pathogens, fostering a healthy environment for your garden and landscape plants.
Finished vermicompost has a crumbly, earthy texture that enhances soil structure, improving its water retention and aeration properties for healthier, more resilient plants. Photo by UF/IFAS.
Below is a summary of the components needed to successfully vermicompost at home.
Worm Bin: Choose a dark-colored, breathable bin that is no deeper than 20 inches. The size of your bin should align with the amount of food waste you produce weekly. As a general guideline, you’ll need approximately 1 sq. ft. of surface area for every pound of weekly food waste. If you’re building a vertical system, consider using three 10-gallon bins, which work well for this purpose.
Worms: You’ll need approximately 1 lb. of Eisenia fetida worm species, which equates to about 1,000 worms, for every 1 sq. ft. of surface area in your bin.
Bedding: Choose moistened carbon-rich organic materials such as newspaper strips with plant-based ink, leaf litter, shredded corrugated cardboard, or coir for bedding. Fill the bin about one-third full of bedding or create a layer no thicker than 6 inches.
Grit: To aid in digestion, mix in one handful of regular soil when you’re starting a new bin.
Food: Worms have a taste for chopped vegetable scraps and most fruits, as well as coffee filters/grounds, leaves, crushed eggshells, and plain grains. As your worm population becomes established, begin feeding them slowly and ensure the food is being consumed before adding more. Smaller food pieces, with greater surface area, are easier for worms to digest. In general, 1 lb. of worms can consume roughly 1/3 lb. of food per day once they are well-established.
Red wigglers hanging through the bottom bin of a “Worm Factory” vermicompost system. Photo by Molly Jameson.
What if I told you there was a way to create compost indoors? No pitchfork required, no hot steamy temperatures, a simple mix of ingredients, and it would fit right under your kitchen sink? As long as you can convince your family to have worms in the house… you can start vermicomposting.
Vermicomposting uses a type of worm called red wigglers. These worms specialize in digesting organic matter, can digest their own body weight in food each day, and can double their population within months. It is, therefore, a wonderful way to responsibly dispose of food waste and can reduce your garbage by more than a third. Microorganisms inside the worms are actually doing most of the work, and the “castings” excreted are teaming with beneficial microbes and nutrients that will condition your soil and make the plants in your garden shine.
You can easily construct a vermicompost bin at home, but you can also purchase one online. Bins should hold about five gallons for one to two people or ten gallons for three to four (Rubbermaid containers work nicely). Your container should not exceed 12 inches in depth, as red wigglers do not like to burrow deeply. You will also want good aeration, so drill holes in the bottom of the bin and either place the bin in another container or put the bin on bricks and use a tray underneath to capture escaped materials. Either way, you will want a lid – as worms do not like light and need moisture – but they also need to breathe, so make sure it is not airtight. Be sure your bin is never in direct sunlight or in a location that regularly exceeds 80°F.
To get started, you will need about 1,000 worms, which weighs about one pound. Red wigglers can also be purchased online, at local nurseries, and some bait shops. Better yet – if you know vermicompost enthusiasts, they may be happy to share.
Before you purchase your worms, you want to prepare your worm bedding. Shredded newspaper and coconut fiber (coir) – which you can find at your local nursery – work great. You will also need to add a small scoop of garden soil to inoculate your bin with microbes. To get started, lightly moisten your bedding material and fill your bin about two-thirds full.
Finished worm castings will be dark, slightly moist, and will have an earthy smell. Photo by Molly Jameson.
Now it is time to add the food. Worms love vegetable scraps, most fruits, moldy bread, coffee filters and grounds, tea bags, and crushed eggshells. Chop their food into small pieces for fastest consumption. Foods to avoid include meat, dairy, large amount of citrus, and onion peels. Start out slow, and put the chopped food in the corner of your worm bin. Once your worms are settled, maintain the bin as half bedding, half food scraps. If your bin looks too dry, add more food. If your bin looks too wet, add more bedding or hold back on food a few days. Bad odors will develop only if the worms are overfed.
Give your worm bin about three to four months, and then you can begin to harvest. Add a handful of castings to potting mix or a thin layer directly to your garden. Give vermicomposting a try – your plants will thank you, your trash will not stink, and you will reduce your global impact.
Vermicomposting bin at the Leon County Extension Office.
It’s difficult to see, but our worms are hard at work composting leftovers!
Many home gardeners may have thought about composting, but may not have the time, the space or, let’s face it, the patience. Well then vermicomposting is ideal to satisfy those conditions! Vermicomposting is the process of using worms and micro-organisms to turn food waste into a nutrient-rich compost called worm castings. Worm composting bins can take up less space than traditional composting bins and can even be kept inside.
Bins can be purchased or made at home, for those who want to compost on a budget. If the home gardener is planning on making their own there are a few things that should be considered. Make sure that the container won’t absorb too much water (such as cardboard), because worms need to stay moist. The container should also be made of a non-clear material. A good example would be 1-18 gallon plastic (not clear) container or a Styrofoam container with a lid. Holes need to be drilled about 4 inches from the top of the bin. Covering the air holes with a type of screen is a good idea to prevent the escape of the composters.
After the bin has been constructed bedding (shredded newspaper, etc.) will need to be placed at the bottom. The bedding should be moistened and then potting soil added on top of that. This will provide a good living habitat for your worms. The Number of worms that need to be added will depend on the container size. When getting worms, make sure to use red wigglers (Eisenia fetida) or African Nightcrawlers (Eudrilus eugeniae). Unlike earthworms found in the garden, these worms thrive in composting bin conditions. They can usually be found at bait stores or local worm farms.
Now its time to put them to work! Worms can be fed daily or weekly. One pound of worms can be fed about half a pound of kitchen scraps per day. When adding scraps avoid using animals products like eggs, cheese or meat. The ideal meal should include small scraps of vegetables, fruits, coffee grounds, bread and paper. When adding the scraps be sure to bury them under the soil. Store the worm bin in an area that does not receive direct sunlight and stays at a constant temperature of about 60 to 80 degrees. Be sure to have a lid for your container, this will keep light out and will also help prevent the appearance of flies. One pound of worms can turn 65 pounds of garbage into garden compost in about 110 days. Compost should be harvestable in a matter of months!
Vermicomposting is a great way to compost for those living in an apartment or those that have kitchen scraps as a main source of compost materials. Worm castings are used just like normal compost. Add them to plants and gardens as a soil amendment, use them in potting soil, or make a compost tea.
