It’s a balmy Sunday in mid-December, and although the neighbors are busy decking out their homes and yards with holiday lights and decorations, it’s unseasonably warm. With a record high of near 70 degrees today, I leave my own lights in their boxes in the attic and plan to devote the day to sprucing up the backyard and taking care of outdoor chores.
There’s wood to chop for the fireplace. I roll a few whole logs from the stack of sawed-up maple drying next to my pile. I stand them on end to split into chunks and soon have set aside enough cordwood to burn well into the new year.
Some of the maple logs are too long for the fireplace, or too knotty to bother chopping. But they will make good new replacements for the rotting logs that contain my pile. The two parallel walls of thick old stacked logs also serve as stepping stones for me to clamber up, and several are now too crumbly to safely perch on.
Today I plan to give my pile a good poking, using an 8-ft. length of rebar I snagged a couple years ago from a neighbor’s scrap bin. Standing atop the log walls requires a bit of a balancing act to thrust the bendy section of rusty, ribbed steel down into the heap of leaves.
I roll two new logs into place, improving both the sturdiness of the log steps and giving me new perches to sit on at the feet of my pile. I also like the look, as along the way I’ve also added some rakings of fresh leaves to the top of my pile. There is always tidying up to do in a backyard garden, especially one as active as mine.
My pile is like a sandbox for grown-up play. It offers endless opportunities to make things up in a playful yet industrious way. It reminds me of the forts we baby-boom suburban kids once made in nearby woods or construction sites to fight imaginary cold-war battles.
Which brings me to the rebar I use to poke my pile.
The rusty stick of half-inch steel weighs just a couple pounds, but climbing atop the log walls and thrusting it a couple dozen times into the midst of my pile gives me a good, quick workout. As an aerating tool, it does a fine job of making my pile more porous, for both water and air.
My pile needs to breathe. It may be chockful of dead stuff but it is a living thing, and to sustain the life within it my pile needs air.
“What you are doing when you construct an aerobic (with air) compost heap is creating the right environment for the billions of microorganisms that make the compost happen. Their food is the materials that you put on the heap,” counsels Nicky Scott in “How to Make and Use Compost.”
“A happy heap will have a balance of air and waiter, just like a squeezed-out sponge; the whole surface area is coated in water but there are air spaces in between. If the pile is too dense, squeezing out all the air, then all the beneficial life forms in the compost heap are not going to survive and will be replaced by the ‘bad’ microbes — the anaerobic (without air) ones that are responsible for all the bad odours you get from putrefying substances. This is bad news for your compost and if you put this material on your plants it can be toxic to them. So creating air spaces in the compost is vital.”
Turning, or tumbling, a compost pile is the surefire way to add big gulps of air to the process, but my pile is too big and unwieldy at this point in its life cycle. Using a hand aerator is much like performing CPR — a remedy used after the fact as a short-term fix.
I try to give my pile good lungs from the start, mostly by building it in layers and using plenty of porous material along the way, mostly the hollow reeds of salt marsh grass gathered from the seashore but also armfuls of spent tomato vines and flower stalks from the cutting garden.
Some years the deer allow me to grow sunflowers along the fence bordering the vegetable garden, and come the fall their thick fibrous stalks make excellent ventilation shafts for my pile. The soft centers rot out — think of sugar cane — creating hollow tubes for both air and water to flow.
Some compost experts advise starting a heap by first sticking a length of perforated PVC pipe in the middle, or a rolled-up tube of wire mesh fence, to serve as a more permanent chimney. I may try that trick someday but for this season will stick with my sticks of sunflower augmented by slender steel.
Jousting with my pile is also instructive.
With a few hard thrusts, back and forth, the rod drives deep into the pile. The rebar ribs make it thrum and give me sensory feedback through the vibrations in my gloved hands. The rod zings like a tuning fork through a section of dried leaves. It tings like sonar when the blunt end strikes an oyster shell caught up in a collection of seaweed from the beach. What’s that tough but squishy part? The Jack o Lantern tossed in after Halloween?
I press harder, leaning into the bar of rebar when it meets the resistance of a thick patch of tightly packed mulched leaves. I press on, and when the tip meets hard ground I feel the jarring end note all the way up to my elbows.
Sometimes when I tug the rod back up and out of its tight pathway, jousting with my pile, it wins, and the pole slips through my gloves. I grab tight and pull harder, fearing that one of these days I’m going to stick the shiv of metal right up under my chin.
I jerk the rod free and clear, using its slender wobble like a tightrope walker to keep from teetering off the log wall.
I make a dozen or more thrusts from each side and front and back, varying the angle of entry each time, making a pin cushion of my pile. In my mind’s eye I see each punch hole as a slender tube of air for water to navigate, a superhighway for countless unseen bugs and bacteria to mix and mingle. I’m creating breathing room for my pile.
The butt end of the rebar glistens with steam. I pull my glove off to confirm: The rod is warm to the touch.
I wonder if the heat is caused by the friction of all my aerobics, so I stick the piece of cooling steel back down into the heart of my pile. I wait a few beats, then draw the end back out to take the temperature of my pile. The bar is hot to the touch. I take it as a good sign that inside my pile is a churning, burning mix of earth, water and air.
It’s smoking hot, my pile.