Wiggly Wonders: Vermicomposting
04 Sep 2009
If you’re interested in environmental sustainability, vermicomposting is one can of worms you’ll want to open.



Worms Gone Wild!
Worms don’t work alone, Anderson says. An army of tiny bacteria, fungi and protozoa breaks the food down into tiny pieces before the toothless worms can digest it in their gizzards, so don’t be alarmed to find other creepy-crawlies or even a little fuzz growing in your bin from time to time. “What comes out the end of a worm is 90 percent bacteria and fungi,” Anderson says, “which exude all the growth hormones and regulators that make for healthy soil.” Some research has shown that greenhouse growers who use worm castings (essentially compost with the look and consistency of chocolate cake crumbs) grow stronger plants with less disease and a longer shelf life. “It’s probably one of the best things you can put on your plants,” Anderson says. You’ll need to harvest castings every three to four months, and add fresh bedding to the bin. To obtain castings, remove all the food remnants and don’t feed the worms for a few days. Then move all of the bin’s contents to one side and add fresh bedding to the empty side. Moisten the bedding, add a few cups of garden soil and eggshells, and bury some food scraps in it. Gradually, the hungry worms will move to the bedding side where the food is. Keep applying food only to the new bedding and, after a month, remove castings from the now-deserted side (minus the paper scraps) to spade into your garden soil. Wear gloves, as you’ll certainly find a few stray worms in the castings compost. Both Anderson and Dudek have seen a marked increase in vermicomposting. “My workshops are just swamped. I’ve never had a response like this,” says Dudek, who instructs teachers in the Boulder Valley and Saint Vrain school districts on how to set up classroom worm bins and also offers school-based workshops for families.