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Are “eco-friendly” herbicidal soaps as innocuous as they sound?

Regular readers of my blog know that I’m convinced that synthetic detergents are a largely unrecognized cause of eczema and are implicated as a likely environmental toxin that has contributed to the increase in rate of chronic allergic manifestations like asthma and food allergy (by its involvement in eczema). When my family learned to differentiate true soap from detergents and removed detergents from our household personal care and cleaning products, we saw dramatic health changes with respect to allergies. This included both kids’ eczema clearing without any further need for steroids or constant moisturizing, my asthma clearing without drugs, and my chronic dry skin healing. (See Part II of Our Story: Results After Switching to Soap).

This experience prompted me to re-evaluate every product I used to think was safe, and to read product claims and labels written by marketing people with a much more critical mind. Even a decade before I had found solveeczema, I was concerned that standard herbicides, most commonly containing glyphosate and 2,4-D, were possibly carcinogenic. (See my post The Temptation to Spray for more background). So, many years ago before I found solveeczema and became convinced that detergents are causing more ills to all living things on the earth than most of us have realized, I saw alternative herbicidal products on the shelf labelled “herbicidal soap” — and thought they might be less toxic than those containing glyphosate and 2,4-D. After all, “soap” sounds innocuous. It’s what we use on our skin, right?

My First Experience with an “Herbicidal Soap” Product

A few years before I found solveeczema, I purchased an “herbicidal soap” product. It was intended to be a replacement to a glyphosate-containing herbicide and I wanted to use it to kill weeds on my paths and among the landscaping rocks on the sides of my house leading to the backyard. I hoped it would do the job without being quite as toxic. It did indeed cause all the weeds growing among the paths and rocks to shrivel up and die.

The summer that we implemented the solveeczema detergent removal, I started becoming more cautious about what I was applying to my yard for weed control. Faced again with the weed problem among my rock paths and on my lawn, I looked through my small collection of varied bottles of weed killer and happened again upon the herbicidal soap I’d used in seasons passed. Because of my experience using the solveeczema website and reading countless labels in search of safe, non-detergent products, I knew that products labelled “soap” do often signify detergents, that “natural” doesn’t have a standard or meaningful definition, and that “less toxic” doesn’t necessarily mean harmless. I had to examine the ingredients more closely to know for sure.

My bottle said ingredients were “ammonium soaps of fatty acids”. To my best knowledge, this is another name for a quaternary ammonium compound. (For a quick step-through of my logical rationale for this, which would bore most people, see the footnote at the end of this post). I’ve blogged about these compounds before — they were the seeming cause of a chemical burn experienced by a child in Ontario from a disinfectant used in his school washrooms. These compounds are nicknamed “quats”, and are very strong detergents. The Wikipedia entry on quaternary ammonium compounds indicates they are detergents and highlights their efficacy as antimicrobials. The section on health effects is both fascinating and frightening.

Concerning Symptoms Reported to Health Canada

Even just based on the active ingredient in these “herbicidal soaps”, I would have concluded they’re probably not innnocuous. But don’t take my word for it. Just Google a alternative name for the active ingredient I found on my bottle — “ammonium salt of fatty acids” — and one of the early search results is a summary of Incident Reports on the Consumer Product Safety section of Health Canada’s website. These are presumably incident reports that the manufacturer of products with active ingredient “ammonium salt of fatty acids” have received from the general public, and have reported to Health Canada.

Reading these incident reports is like reading a “who’s who” of “familiar reactions I’ve seen in my own and others’ children in reaction to detergents”. In reading through the reports, we have several people who accidentally made skin contact with the product and reported symptoms varying in severity, but mostly involving red, irritated skin, rash, itching, and in a few cases, something approximating a burn. The symptoms were bad enough that physicians were consulted in some cases. Most of the reports of skin irritation were made around 2 days after contact, and in general took anywhere from 2-5 days to get better. One person reported she developed a cough while applying the product which spontaneously stopped once she left the application area, but started again when she re-entered the application area. Unfortunately, this caller was told that these symptoms could be experienced by “sensitive individuals” who can react to the “perceived aroma of herbicides and pesticides” with respiratory irritation. I don’t believe this to be correct, because, much like my theory of why my own asthma has been impacted by detergents, I think this caller was probably experiencing respiratory irritation caused by the inhaled detergent increasing the permeability of the lung membrane and increasing allergen penetration into the lungs, thus causing inflammation, irritation or wheezing. Nothing to do with “perceived aroma of herbicide”. What kind of pseudo-fakey-fake answer is that?

Perhaps most concerning, though, was a report from a mother about her son who was helping her apply the herbicidal product. Within 2 days, he developed hives and a rash from “head to toe”, as well as itchy eyes. He was brought to a physician who said his reaction indicated an allergic response to some unknown antigen. Symptoms persisted for 3-4 days. The caller was told this was an “unexpected response” to the product, but knowing what I know about detergents, I think his response was completely within the realm of reasonable expectation. It is unfortunate that this mother was told otherwise, and that at time of routine callback, the mother was still not sure what could have caused such an extreme reaction.

I am not surprised at the type of reactions these people reported, and I don’t think these symptoms are “in their head”. These reactions are consistent with what we’d hypothesize from understanding the solveeczema theory and what someone like me, who has seen what my children’s skin did when we were surrounded by detergents in our home environment vs. how their skin healed by itself and without ongoing drug intervention when detergents were removed from our environment, would guess would happen.

Conclusion: They’re Not As Harmless As They Sound!

My conclusion is that this is another example of how detergents really are everywhere, they affect every sphere of our lives. We must be cautious, careful, and critical in what we choose to use and surround ourselves with. While these compounds may arguably be safer than compounds that are carcinogenic, I don’t believe that these are innocuous by any means. They may not be as toxic, but they are toxic nonetheless, and, I believe, cause harm. Use with caution, or better yet, find natural or mechanical methods for dealing with weed growth or insect manifestations that do not require chemical spraying.

Footnote:


See the Wikipedia entry on ammonium where it indicates ammonium is a general name for quaternary ammonium cations, and later indicates the ammonium cation is “found in a variety of salts” in the Ammonium Salts section.

Dandelion
Dandelion on My Lawn (c) Julie Leung

The Temptation to Spray

I have been battling with dandelions for nearly 20 years, since I first became a homeowner. My approach has evolved over the decades from unreservedly and liberally using herbicides to various shades of manually managing them by pulling, mowing, or otherwise “natural” methods of controlling them. We moved to our current house when my son was a baby and have mostly tried to control the dandelion weed population by natural methods here.

Over the years, I have amassed many different dandelion pulling gadgets, but this one, handed down to me by family friends of my parents, remains the simplest and typically most effective.
Over the years, I have amassed many different dandelion pulling gadgets, but this one, handed down to me by family friends of my parents, remains the simplest and typically most effective.

Every year, I struggle with the temptation to spray the lawn and be done with it. And every year, I instead opt to try something new in my quest to manage my dandelion problem without using harsh herbicides. This reluctance is shared by a growing number of people, as we discover that the “quick and easy” chemical solutions our parents were sold on actually have underlying and often long-standing and extensive consequences or that “Better Living Through Chemistry” is not always true. My journey to this conviction was no different.

What’s My Problem With Herbicides?

2,4-D and glyphosate are arguably the most commonly-used herbicides (marketed under a number of trade names). 2,4-D is commonly used for dandelion control because it is selective to broadleaf weeds but leaves grass alone. The mechanism of action for 2,4-D is death caused by uncontrolled growth. Um, that’s basically the definition of cancer. The mechanism of action for glyphosate is inhibition of the synthesis of 3 amino acids which are needed for protein synthesis and synthesis of compounds necessary for cell replication and metabolism: very basically, inhibition of processes necessary for life.

Yet, the research is contradictory. Even amongst international agencies, there is disagreement. In 2015, the World Health Organization’s International Agency for Research on Cancer classified glyphosate as “probably” carcinogenic to humans and 2,4-D as “possibly” carcinogenic to humans. Other branches of the WHO later ruled (2016) that glyphosate is unlikely to cause cancer in humans through diet, and the EPA had earlier (2007) ruled that existing data do not show a link between 2,4-D and cancer. There are also arguments that these compounds affect plant biochemical pathways only and don’t have the same effects on mammals. Fair enough. But not having the same effects does not necessarily mean not having any adverse effects.

My thought process about the dangers of herbicidal sprays is much simpler and goes something like this:

Stated simply, something that does not naturally occur in nature and significantly alters the biochemical pathways of a living thing to the extent that the living thing is killed, cannot be good for humans.

When I look through the discoveries made even in the past 40 years, for example, time and again we have discovered that something we once thought was safe and had no effect, actually has long-standing and serious consequences for animal populations and ultimately us. Look at what we have discovered about PCBs, DDT, and Dioxins. About pesticides we once thought only impacted animals (and who cares about them, right? sigh) but had no deleterious effects on humans. About the impact on aquatic life (and, if you follow my blog, ultimately on humans too!) of seemingly harmless compounds like detergents and phosphates. About all the things that work in fine balance in our ecosystem, that are disrupted when even just one thin arm of that ecosystem is taken out. And in my specific case, given my convictions about the negative and largely unrecognized effects of detergents, I am particularly hesitant to spray herbicides because they often contain detergents to break the surface tension of the liquid and help spread the spray.

And Yet, I’m Still Tempted to Spray

After having said all that, I admit that I am still tempted to spray. Every year, at around this time when the dandelions are at their busiest; when I spend an hour of back-breaking (literally, my back and knees ache after I’m done) work picking dandelions, and come back the next morning to discover even more dandelions have now flowered, like I made absolutely no dent in them; when I dig a big, thick dandelion and discover an indentation in the ground where it is growing and realize I’ve dug this same one year over year and it made no long-lasting difference; when I stand up after an hour thinking “that’s enough for now, I need to move on with my day” and can still see dozens of untouched dandelion bodies that haven’t flowered yet; when I finish in the front yard and then realize I still need to tackle the back yard; when everyday in May and early June my precious spare time is spent digging dandelions rather than tending my garden, writing my blog, or enjoying time with my children; when I cannot shake the growing feeling that I’ve been doing this “natural thing” all wrong and am probably making the dandelion problem worse with my actions … I am tempted to spray.

So many dandelions on my lawn.  This patch is particularly bad because it was poorly dug up by me in the past.  My heart sinks after I spend an hour meticulously pulling weeds only to see several more flower the next day.
So many dandelions on my lawn. This patch is particularly bad because it was poorly dug up by me in the past. My heart sinks after I spend an hour meticulously pulling weeds only to see several more flower the next day.

Maybe I can just spray one year to once and for all kill all the buried taproots, and then go back to my natural solutions, I think. Maybe I can just spray at the end of the season when the kids aren’t on the lawn, I think. Maybe I can just spray the front and never let the kids play on it, relegating them to our backyard, I think. Maybe, maybe, maybe.

This year, I haven’t given into my temptation to spray yet. Like every year past, this year I have decided to step up my natural efforts and, armed with better knowledge, see if this is the year that I will get the advantage over these dandelions in a safe, natural way.

All The Natural Approaches I’ve Tried

Just a recounting of all the approaches I’ve tried in the past is dizzying:

  • Merely plucking the heads off the dandelions so at least they don’t go to seed and spread
  • Mowing frequently so the dandelions don’t get a chance to go to seed
  • Spraying them with various concentrations of vinegar
  • Spraying them with some combination of home-made vinegar, salt and detergent solution
  • Digging them
  • Digging them, filling the indentation with soil, re-seeding with grass
  • Attempting to outcompete the weeds with grass by improving grass health: leaving lawn clippings on the lawn after mowing, re-seeding the entire surface of the lawn with grass seed
  • Spreading corn meal gluten all over the lawn as a pre-emergence treatment (prevents seeds from taking root)
  • Adding fertilizer to the lawn early in the season and at the end of the season in an attempt to strengthen the lawn to outcompete the dandelions
This year, instead of making a homemade vinegar / salt / detergent spray, I thought I would try to boil down leftover pickle juice to make a super-concentrated spray.  Did you know that pickle juice has vinegar and salt, and yes -- even detergents (polysorbate80) in it?  I squirted this into the hole leftover after I picked some dandelions, but I'm not convinced it is strong enough to kill the taproot.  The next day, some of the grass around the dent was yellowed, which tells me it's working on some level -- just maybe not the level I need!
This year, instead of making a homemade vinegar / salt / detergent spray, I thought I would try to boil down leftover pickle juice to make a super-concentrated spray. Did you know that pickle juice has vinegar and salt, and yes — even detergents (polysorbate80) in it? I squirted this into the hole leftover after I picked some dandelions, but I’m not convinced it is strong enough to kill the taproot. The next day, some of the grass around the dent was yellowed, which tells me it’s working on some level — just maybe not the level I need!

I Realized I Was Inadvertently Making the Problem Worse!

This year I’ve been working on my dandelion problem with a bit more knowledge under my belt (both from concepts discussed in our Grow Food Calgary class and reading on my own). That knowledge combined with continuing to see that I’m digging the same old places year after year, and that some of the biggest, most gangly dandelions come out of the same old places, I now actually think my past actions have made the problem worse. Here’s why.

  • When I merely plucked the heads off before they seeded, or relied on mowing to control the dandelion problem, I was actually dead-heading the dandelions. Just like we would dead-head our basil plant to encourage more bushy growth, I was pretty much doing this to my dandelions. No wonder there are many that are just so thick, wide, and have so many flowering heads!
  • When I dug them, I often did not dig deep enough to get the entire taproot out, so in subsequent years, the dandelion came back in the same place, with an increasingly stronger and more extensive taproot to support it
  • When I used homemade sprays or very concentrated vinegar solutions, all I ended up doing was killing the grass around the dandelion too. I don’t think these sprays are strong enough to get to the root to kill it, so I was just leaving a dead spot ready for new dandelion seeds to take root, in addition to the re-emergence of the old plant from the left-over taproot
  • When I dug them and filled the dent with soil and then reseeded grass seed, I filled with very poor quality, dead dirt. It was the cheapest stuff we could find at the store and had big chunks of unbroken woody bits. The fact that I’ve usually left the taproot in the ground and tried to grow grass seed on top of that, and in dead dirt that doesn’t support growth, to boot … is it any wonder this didn’t work?
In the past, I didn't dig deeply enough to get the whole taproot out.  In past years, I thought getting out something like the dandelion on the right was enough, but in fact the taproot goes much deeper, as seen in the dandelion on the left.  I've changed my approach recently, but my I'm disappointed and a little desperate when a dandelion breaks off like on the right, and I know I've left a big root in the ground.
In the past, I didn’t dig deeply enough to get the whole taproot out. In past years, I thought getting out something like the dandelion on the right was enough, but in fact the taproot goes much deeper, as seen in the dandelion on the left. I’ve changed my approach recently, but I’m disappointed and become even a little desperate when a dandelion breaks off like on the right, and I know I’ve left a big root in the ground.

What I’m Trying This Year

So this year I am going to try to actually dig out the full taproot. This takes a lot more time and effort, and many times I worry that I’ve left small branch offshoots or even the very end of the taproot in place. When the root comes out and I see the white latex-like bleeding from parts of the root, my heart sinks. I think there’ll be another dandelion there next year, just hopefully smaller.

A recent pull where I could see the bleeding latex-like substance from the root and know I've left some of the root in the ground and that there will be another dandelion coming up in the same spot next year, just hopefully smaller.
A recent pull where I could see the bleeding latex-like substance from the root and know I’ve left some of the root in the ground and that there will be another dandelion coming up in the same spot next year, just hopefully smaller.

Earlier in the season, I thought to squirt some of my concentrated pickle solution down the hole. I’m not convinced this actually helps, and then I’m also putting detergent on my lawn where my kids play and killing lawn around the hole, no matter how carefully I squirt this stuff. I probably won’t continue with this.

My next step will be to cover the indents with corn meal gluten to prevent seeds from taking root in the exposed dirt/dent. After some time and this has broken down a bit, maybe I’ll re-seed the dent with grass seed — only after putting some good quality soil into the dent first! I’m not actually sure whether I should prioritize putting down the corn meal gluten or soil/grass seed. I’m not sure how long to wait after putting down the corn meal gluten to try to re-seed, either.

From what I’ve learned in my gardening class, theoretically I should also be able to encourage a healthy lawn by sprinkling good quality soil, finished compost, worm castings and maybe even the compost liquid from a worm farm, onto the lawn and then reseeding with grass seed. I’m not ready for that yet because I need to prioritize using those amendments for my garden soil first.

And Yet, Back to the Temptation to Spray

But before all that will really work, I think I need to get the existing dandelion problem with all the thick and extensive taproots that are already in place below ground, under control first! Now that I’m hopefully not making the problem worse by dead-heading the dandelions and leaving large chunks of taproots in the ground, will it eventually get better and better every year? Will it be another several years of back-breaking work before I gain the upper hand on the dandelions? Sure makes me consider spraying — just once, just one year. Then, I think, I can start with a clean slate. The internal debate just never ends!