10 easy steps
What is vermiculture?
How to start your own vermiculture?
- Material: Rubber is cheap, easy to use and durable. Galvanized tubs are somewhat costly but will last forever. Wood will eventually be eaten, and plastic cracks easily, but either will do in a pinch. Some people prefer wooden compost worm bins because they may breathe better and absorb excess moisture, which can be hazardous to the worms. Just don't use chemically-treated wood, which may be dangerous to worms or leach harmful chemicals into your compost. 5-gallon plastic buckets now for sale by most hardware stores can be used - especially if you live in an apartment. Clean the 5-gallon buckets thoroughly with soap and let them sit for a day or so filled with clean water before using as a worm bin.
- Ventilation: Your bin should be well-ventilated, with several 1/8 inch (3mm) holes 4 inches (100mm) from the bottom (otherwise the worms will stay at the bottom of the bin and you may drown your worms). For example, you can build a worm bin out of a large plastic tub with several dozen small holes drilled out on the bottom and sides. Untreated wooden bins are naturally ventilated because of structure of wood.
- Size: The larger you make the container, the more worms it can sustain. Estimate 1 pound (0.45kg) of worms for every square foot of surface area. The maximum productive depth for your bin is 24 inches (61cm) deep because composting worms will not go further down than that.
- Cover: The bin should have a cover to prevent light from getting in and to prevent the compost from drying out. Choose or make a lid that can be removed if your compost is too wet. Use a canvas tarp, doubled over and bungee-corded on, or kept in place with wood. Burlap sacks also work well, and can be watered directly.
- Place a layer of heavy newspaper on top of the bricks. Stuff four old tires with newspapers.
- Pile the tires on top of each other, with the first tire on the Sunday newspaper. Put some scrunched up paper or cardboard in the bottom to soak up any excess liquid.
- Fill the entire wormery with organic material (semi-composted is best). Add the composting worms (tiger or brandling species are best).
- Use a piece of board weighed down with bricks as a lid. The lid must be big enough to stop rain getting in.
- Harvest a tire's worth of fertilizer roughly every 8 weeks (during warm months).
Place the worm bin in a cool area to protect it from excessive heat. If you're keeping your worm bin outside, consider placing it in the shade, under a tree, in the garage or shed, or along the side of the house.
- Try keeping the outdoor temperature in the bin between 30 and 90 degrees Fahrenheit, along with at least 4 inches of moist bedding in the bin. This should be an ideal home for your compost-zapping worms.
Prepare the bedding for your worms. The bedding is the natural habitat of the worm that you're trying to replicate in your compost bin. Fill your bin with thin strips of unbleached corrugated cardboard or shredded newspaper, straw, dry grass, or some similar material. This provides a source of fiber to the worms and keeps the bin well-ventilated. Sprinkle a handful of dirt on top, and thoroughly moisten. Allow the water to soak in for at least a day before adding worms.
- Over time, the bedding will be turned into nutrient-rich compost material by the worms. When you harvest the composted soil, you'll have to introduce new bedding into the worm bin again.
- Canadian peat moss, sawdust, (rinsed) horse manure, and coconut pith fiber are also great for composting.
- Avoid putting pine, redwood, bay or eucalyptus leaves into your bedding. Most brown leaves are acceptable in vermicompost, but eucalyptus leaves in particular act as an insecticide and will kill off your worms.
- The worms most often used, Eisenia fetida (Red Wigglers), are about 4 inches long, mainly red along the body with a yellow tail. These worms have a healthy appetite and reproduce quickly. They are capable of eating more than half their own weight in food every day.
- Another variety to consider are Eisenia hortensis, known as "European night crawlers." They do not reproduce quite as fast as the red wigglers, but grow to be larger, eat coarser paper and cardboard better, and seem to be heartier. They are also better fishing worms when they do reach full size.
- However, as with any non-native species, it is important not to allow European night crawlers to reach the wild. Their voracious appetites and reproductive rates (especially among the red wigglers) have been known to upset the delicate balance of the hardwood forests by consuming the leaf litter too quickly. This event leaves too little leaf litter to slowly incubate the hard shelled nuts and leads to excessive erosion as well as negatively affecting the pH of the soil. So, do your best to keep them confined!
Feed your worms digestible amounts regularly. The bedding of your compost bin is a great start, but the worms need a steady diet of food scraps in order to stay healthy and produce compost. Feed your worms at least once a week in the beginning, but only a small small amount. As the worms reproduce and grow in numbers, try to feed them at least a quart of food scraps per square foot of surface area each week.
- Worms eat fruit and vegetable scraps; bread and other grains; tea leaves; coffee grounds; and egg shells. Worms eat basically what humans eat, except they are much less picky!
- If you can process your scraps before you introduce them into the compost bin, you'll find that your worms will eat them quicker. Worms go through smaller-sized food more quickly than they can larger-sized or whole food. In this respect, they are also like humans.
- Mix the scraps into the bedding when you feed the worms. This will cut down on fruit flies and will give the worms more opportunities to eat. Don't just leave the scraps on top of the compost heap.
Maintain your bin. Keeping your bin elevated off the ground, using bricks, cinder blocks, or whatever is convenient will help speed composting and keep your worms happy. Worms are capable of escaping almost anything, but if you keep your worms fed and properly damp, they should not try to escape. A light in the same area will ensure your worms stay put.
- Sprinkle the surface with water every other day. You want your bedding to have the dampness of a wrung-out sponge.
- Add more cardboard, shredded newspaper, hay, or other fibrous material once a month, or as needed. Your worms will reduce everything in your bin quickly. You will start with a full bin of compost or paper/cardboard, and soon it will be half full. This is the time to add fibrous material.
Pay attention to some composting "dont's". Composting bins are not difficult to maintain, but they do need to be looked after. Here are some things that you shouldn'tdo if you want a healthy, hearty ecosystem.
- Don't feed your worms too much. If your compost bin starts to smell, it could be because you are feeding your worms more than they can process. When this happens, the bedding can also heat up, killing off the worms.
- Don't feed your worms any combination of the following. These foods are difficult for the worms to digest:
- Excessive citrus — no more than 1/5 of the total worm food
- Meats or fish
- Fats or excessively oily scraps
- Dairy products (eggshells are fine)
- Cat or dog feces
- Twigs and branches