Worm composting: What happened after I bought a Worm Factory and 1,000 red wigglers.

I Bought 1,000 Worms and Kept Them in a Box in My Kitchen

I Bought 1,000 Worms and Kept Them in a Box in My Kitchen

What to eat. What not to eat.
Feb. 27 2013 8:38 AM

My Worms

Adventures in composting with 1,000 red wigglers.

A cluster of Red wigglers worms in the hand of a composter's yard in Newport News, Virginia.
Red wigglers

Photo by Adrin Snider/Newport News Daily Press/MCT/Getty Images

They arrived early on a Tuesday morning in a cardboard box. “1000 Red Worms,” read the label in large letters printed beneath the USPS tracking number. Return address: Uncle Jim’s Worm Farm. My mailman handed the package to me with no emotion, but I was excited. Inside were the catalysts for my latest experiment: vermicomposting. Or, to be less Latinate about it, composting with worms.

I’d first become acquainted with the idea of composting—that is, using microorganisms to turn food scraps into soil—when I lived in northern California with roommates who used old peanut butter jars as glassware and spent a considerable portion of their meager incomes on bulk lentils. One of them had a book on composting called Do the Rot Thing, and I occasionally glanced through it while making lunch. It was intriguing, this idea of transforming a pile of vegetable trimmings and yard clippings into nutrient-rich soil, but I couldn’t imagine doing it myself. The very fact that it required a book suggested it was complicated, and the title perfectly captured my dilemma: I wanted to do the right thing, to minimize my trash and be virtuous and eco-friendly. But I was scared of the rot.

In Oakland, the city solved my problem for me: It ran an official compost program that hauled away kitchen and yard scraps along with the rest of our recycling. But Philadelphia, where my husband and I currently live, has no such system. I tried to readjust, but the Californian hippies had infected me—after two years of segregating my garbage, tossing my banana peels in with my other trash just felt wrong. Adding to my guilt, we have a small garden in Philadelphia that would be a perfect place to apply compost. I felt caught between my desire for great dirt and my fear of doing it wrong. I wanted rich, dark, beautiful compost that was fast, idiot-proof, low-maintenance, and worry-free. 


Enter the worms. Whereas traditional composting relies solely on microorganisms like bacteria and fungi to break down food particles into new soil (and requires active maintenance so it doesn’t stagnate), in vermiculture, worms speed up the process for you. Once microbes have taken care of some of the predigestion (worms don’t have teeth or many digestive fluids), the worms suck the food through their mouths. Inside their bodies, strong muscles and particles of sand and grit grind the food into even smaller pieces; microbes in their intestines then finish the digestion, converting the food into nutrient-rich castings—a fancy word for worm poop. Vermiculture is like normal composting, turbocharged.

The simplest form of vermicomposting—besides what’s already happening in your yard—is to fashion your own vermicomposter out of a plastic tub. The challenge with such an approach is that, much like nonworm composting, it requires confidence that you will be able to “manage” your bin—i.e., keep it aerated and balanced enough that it will not just devolve into a stinky box of dead worms and rotting vegetables. I did not have that confidence. So I went with option No. 2: Buy a Worm Factory®.

The Worm Factory, available on Amazon, is basically a stack of square plastic trays, their bottoms perforated like sieves, that rest on top of a base unit designed to catch any fluid that leaches out of the composting material. (This fluid—known by the repulsive nickname of “worm tea”—is a prized fertilizer in its own right.) You start with just one tray of worms, feeding them handfuls of food scraps (fruit and vegetable peelings, egg shells, and coffee grinds, mostly—meat and dairy are forbidden) and topping each deposit with shredded paper or dried leaves (which keep the compost from smelling or attracting fruit flies and eventually get eaten by the worms as well). Then, once the tray is filled, you add another one on top, containing a starter pile of more scraps. The worms, seeking new food, migrate upward through the holes in the bottom of the new tray and leave you with a bottom tray full of beautiful compost. When the second tray is full, you add another one on top, and so on until you have a short tower of compost-filled trays, a self-contained worm industrial complex.

The worms in question are not garden earthworms. Apparently they have a thirst for freedom that is not desirable for creatures you’re planning to keep in a box in your kitchen. Vermicomposters favor the red wiggler, a docile worm with no exploratory tendencies and that likes to live in colonies. (Their Latin name, Eisenia fetida, also hints at red wigglers’ less celebrated habit of releasing a foul odor if handled too roughly.)

The worms are also sold separately from the Worm Factory, hence my shipment from Uncle Jim. Shortly after they arrived, so did my Worm Factory, accompanied by a 16-page instruction booklet that informed me, “In full operation, your worm composter … will house 10,000 to 12,000 worms.” I didn’t know whether to find this inspirational or terrifying.

Pushing aside that question, I screwed the parts together and began to prepare the worms’ new home.

The instructions told me to line the bottom of the first tray with several pieces of newspaper, but since our recycling had just been picked up, I settled upon the front page of my husband’s New York Review of Books.

Next I was to add the coir, a term which I eventually figured out referred to the fibrous brick of shredded coconut husks that came along with the composter; its purpose was to help keep the compost aerated. I was supposed to mix the loose coir with a cup of active compost, a step that struck me as a little chicken-and-egg—if I had an active compost pile, then why would I have bought a worm composter? But there was no time for philosophical contemplation. I made an approved substitution—decayed leaf litter from under a bush—and (Step 3) dumped it on top of a Paul Krugman byline.

I finished my preparations by placing two handfuls of vegetable scraps in the corner on top of the bedding, covering it with more shredded paper, and finishing with three sheets of moist newspaper from the personals section. Then I untied the bag and deposited my worms into their new home.

I was supposed to wait three days after setting up my worms before checking in on them, but I made it only 24 hours before lifting up the lid to see what was happening inside. I felt a sort of curiosity I hadn’t experienced since I was about 6 years old and had an Uncle Milton Ant Farm—one of those sand-filled terrariums skinny enough to reveal a cross section of the ants’ tunnels so you can see what they’re doing. I loved that thing; I remember getting up early in the morning to inspect it before school, gazing at the tiny, industrious creatures inside.

The only problem with my ant farm was that all my ants had quickly died. So, for that matter, had my goldfish, gerbils, and hamsters—my track record with small pets was not so great. Fearing that my worms would meet a similar fate, I started acting like an anxious parent, opening the box each morning and poking around to see if they were OK. Was the paper wet enough? Was it too dry? Had I given them too much to eat? Not enough? I was supposed to check to see if they were “working” on their food, but how does one tell if a worm is working on something? Sure, there were some worms in the food corner, but there were also many worms away from the food corner, their activities unclear. The instruction booklet didn’t answer my questions, but it did firmly state what the consequence of a poorly managed worm bin might be. “Be careful,” it said. “Worms can become stressed, which will cause them to group up in a ball or even crawl out of the bin.”