I suppose I should explain how I got into worms in the first place. I planted my first garden in Santa Cruz, California about eight years ago (and wrote a book about it called From the Ground Up: The Story of a First Garden), and it wasn’t long before I was buying every garden accessory and toy I could get my hands on. I had a serious Saturday-morning nursery habit. Most of my paycheck went to plants, rakes, shovels, and bags of compost. I was in deep.
One morning the nursery had a display of worm bins for sale. The bins, which are called Can-O-Worms, consist of three round stacking trays with small holes in the bottom. You stack the trays on a sturdy plastic base, introduce worms into the bottom level, and eventually they work their way through each level, eating kitchen scraps as they go. Once they’ve massed in the top tray, the bottom tray is usually full of castings—worm manure—that is ready to go into the garden. You empty the bottom tray, make it the new top tray, and keep going. The worms never leave the bin; they just move through each tray in an endless cycle of eating, reproducing, and—well, shitting.
It’s hard to say why the worms appealed to me so much, exactly. Part of it is that I wanted that worm shit, which is the finest cuisine you could feed a plant and extraordinarily expensive if you buy it retail. Part of it was that I liked the gear. A worm bin is hip, in an organic, northern California way. And part of it is just that a colony of anything is fascinating to watch. Ants, bees, worms—they all have curious customs, unfamiliar ways of life, and I thought I’d find them entertaining.
Now I have thousands of worms living in two bins on my back porch, and they’ve kept me entertained for years. They are good pets, loyal and hardworking, and they earn their keep. I wrote this book—the new one, The Earth Moved—for a lot of reasons, but one of them was that I wanted to pay tribute to the inveterate invertebrates that live their lives outside my kitchen door, devouring my coffee grounds and my morning paper, leaving their rich black castings behind.