Red Cabbage Ph
Posted: March 6, 2026 Filed under: Child Centered Activities, Chronicles of a First Time Parent, What is an Art Farm | Tags: Social ecologies Leave a comment
Nettlesting is a Mother Tree, whom I met, almost 30-years ago, in the Fulton Market District on Chicago’s near west-side. When that city was the “Hog Butcher to the World” that neighborhood was home to its meatpacking warehouses, but circa 1998, gentrification spread, and we each occasioned to be there for a Childrens’ art exhibit. She walked up, we started talking.
In 2000, our paths crossed again, in Chicago’s Financial District canyons, on LaSalle Street, outside the once venerable Harris Bank, which now has been merged into the global behemoth BMO. I was preparing to depart for the Philippines – a land of smoke and mirrors – on my oxymoronic quest for “Humanitarian Finance” while she was preparing to WWOOF (Worldwide Opportunities on Organic Farms) in the full sunlight of Southern Australia.
Being a Mother Tree, she is a steward of Gaia who thrives at the vanguard of soil and soul. Like a zen koan, she is not an artist, but one might say she is an eARTheart-ist.
In 2004, she planted six kernels of “Golden Bantam” organic heirloom 1902 sweet corn in a shopping cart and then proceeded to push it around Chicago’s dense urban core. People were confronted by food growing, rather than food as a commodity purchased in a store. “Know your food, know your farmer” came alive on street corners. [Search You Tube for “Field Trip. A cart full of Corn Hit’s the Road.”]
In 2006, Sandor Katz, the NY Times best selling author, profiled her guerrilla gardening in his book “The Revolution Will Not Be Microwaved.” By 2012 she was named as one of Utne Reader’s “Twelve Visionaries Who Are Changing Your World.” That now ancient history was prologue, however, to the work she has gone on to pursue.
In 2020 she travelled in the Ecuadorian Amazon basin and worked with Indigenous peoples as well as local growers, developing classes on soil and remediation. The BBC reported this, quoting her, “The ultimate goal is to create an ecosystem of native plants and crops that can be farmed sustainably while also cleaning up the oil. I’m trying to have people re-engage with certain subtle complexities of nature…”. https://www.bbc.com/future/article/20200316-cleaning-up-the-oil-spills-of-the-amazon-rainforest.
Her “Soil Keepers” program grew out of this effort, and has now been taught to more than 250 students around the United States, as well as in Qatar, Finland, Poland, and Ecuador. https://socialecologies.net/
Over the years we have kept in touch and she recently came east to soak in the rocky coast of Maine. Our oceanic expanse served as counterbalance to the Great Lakes’ prairie. She and my son M got along quite comfortably and an idea was hatched.
Science is not my strong suit. In high school Chemistry, the concept of a mole as “a unit of measurement to quantify the amount of a substance, representing exactly 6.022 × 10²³ elementary entities (atoms, molecules, ions, or particles)” was bewildering. I dropped out post haste to study ceramics. I never looked back.
Necessity, though, is the mother of homeschool innovation. Between M’s needs and my lack of science training, when the Mother Tree offered to teach him soil science I accepted post haste; what I call soil science is, more precisely, applied biogeochemistry, starting with applied chemistry through field work and kitchen-based experiments. It is amazing what red cabbage can teach about Ph.
This week we rolled up our sleeves. Following the Soil Keeper’s lesson plan, we finely chopped 5.4 pounds of red cabbage and then boiled it in one gallon of neutral Ph water. M selected 20 household items, then put 15ml of each into a small jar with 50ml of the deep purple cabbage water. The materials included lime and lemon juice, apple cider vinegar, pickle juice and hot sauce; clean snow, dirty snow, calcium chloride salt, and a salt/sand blend; wood ash and sawdust, an organic 4-3-3 fertilizer, mortar and grout (from the tiling); bleach, baking soda and table salt.
With the certainty that is science, before our very eyes the cabbage water changed color depending upon the acidity or alkalinity of the materials. The acids turned pink, while the alkaline moved to green or even yellow.
By day three, we made notes about the experiment; more precisely, my son wrote out sentences. As we began, he commented, “I remember Science class in 5th or 6th grade always taking notes. I find it hard to take notes.”
He began with simple sentences, but as his excitement grew, they became compound and complex: “Lime was the most acidic. The most alkaline was bleach. The “Midnight Black” grout went from black to light green, and slowly became a darker green in the layers; the grout mix fell to the bottom because it was heavier. The 4-3-3 mix was next to the mortar….”
We talked and drilled deeper. While tiling, the Professor had mentioned that Lime was an ingredient in mortar. M researched and discovered (a) mortar contains lime from dolomitic limestone, (b) lime comes from rocks that contain 80% or more of calcium or magnesium carbonate, (c) Espoma Bio-Tone 4-3-3 contains calcium (at 5%) and magnesium (at 1%), and (d) he concluded, “Therefore, it makes sense that 4-3-3 mix and mortar are next to each other on my Ph scale because they both contain the main ingredients in lime.”
Excitedly, he reasoned, “What lime is doing to the soil is technically the same thing as calcium supplements do to humans.” He paused, then said, “Wait, it is not the same thing…” and so he corrected his sentence to [emphasis added], “What lime is doing to the soil is related to what calcium supplements do to humans. Calcium, to humans, supplements human bones. Calcium, in soil, supplements the cell walls.”
He then asked, “what is dirt made of?” Soil, he learned, contains minerals 45%, air 25%, water 25% and organic matter is 5%, while its texture is the ratio of sand, silt and clay particles.
He exclaimed, “I have never been so invested in a science lesson! This is fun…this is genuinely fun!!!”
About the circle of life, he discovered, “nutrient transfer: plants take up essential elements from the soil and convert them to organic matter consumed by humans.” Did someone say, “know your food, know your farmer” ?
Having only just begun, he pondered why pickle juice and sawdust were beside each other on his Ph scale. His research lead to this conclusion: “The reason pickle juice and sawdust were next to each other was because pine and spruce are softwoods, and more acidic than hardwoods. We got the sawdust from the table saw, and have been cutting pine and spruce for the tiling work. That makes sense.”
“Just two more questions?” he pleaded. He chased down that softwoods are more acidic than hardwoods due to acidic resins, while oak is a hardwood that can be more acidic. Pickle juice is highly acidic, typically 2.5 to 3.9. In contrast, sawdust from pine, spruce, fir is neutral to slightly acidic; pine = 4.1 to 5.3, spruce = 4.7 to 5.8, fir = 5.2 to 5.9. “So, pine is more acidic while fir is more neutral,” he concluded.
“What if we try this again in the summer? We can test the soil when the plants are growing!”
And so our Red Cabbage Ph experiment came to an end. His bristling excitement a testimony to what happens when a student sits beside a Mother Tree, pondering soil and soul.
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NB: The astute reader may have noticed that here at an Art Farm we use no proper nouns. That is intentional, to underscore the mythopoetic, more than the rational. For example, whatever Ultimate Truth may be, it has more than 1,000 names, which is to say proper nouns, none of which capture the grandeur or sublimity of that whole, many of which lead only to wars.
Humans give names to bring order and cognitive structure to a complex world; naming divides subject from object, while “being” remains intransitive, a verb which takes no object. “Divide and conquer” is a tool of would-be authoritarians and Emperors which leads us to fight to the bottom. In these challenging times, then, let us be together, undivided, to rise to new heights and an expansion of consciousness. And to that end, my pronoun is “We.”
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an Art Farm 