Don't Bet Your Garden on Mike McGrath's View of Native Plants

By chance, while heading out to a March 31 workday to rescue some flowering dogwood trees from invasive porcelainberry vines at the Princeton Battlefield, I happened to turn on my car radio just as Mike McGrath, host of the You Bet Your Garden" show, was answering a question about native plants. Though I have respect for anyone knowledgeable enough to field questions on any and all aspects of gardening, and who can make the subject entertaining enough to sustain a radio program, McGrath also needs to know his limits, and plant ecology is one of them. He pretends to speak with authority about invasive species, when in fact he is simply passing along misinformation.

Below is a transcript of McGrath's answer, spoken in front of an audience at the Philadelphia Flower Show, with embedded critiques showing how he misleads audiences with his superficial knowledge, emotion-based arguments, and the creation of a despised "Other" that veers towards demogoguery, in direct contradiction of his live-and-let-live facade. His faux arguments are part of a genre that I have critiqued in detail online, most recently in a book review of Inheritors of the Earth in the professional journal, Biological Invasions.

QUESTION: ”My next question is if you could talk about the benefits of planting native species, as opposed to some of the stuff that you buy in big box stores that never seem to work.”

MIKE MCGRATH: 

“This to me is a controversial topic."

Only one sentence into his answer and he's already sounding problematic. False controversy is used in climate change denial to suppress acknowledgement of its reality, and to delay action to solve the problem. As an example, an April 1 NBC Nightly News story about proposed rollbacks on fuel efficiency standards didn't even mention climate change--the primary motivation for the standards. Beware of the "controversial" label, particularly when controversy is artificially created and sustained with bogus arguments, like some that McGrath uses later in his answer.

"I know native plants are hot and I know there are people who treasure native plants, Doug Tallamy, I mean, of the University of Delaware who probably speaks here as much as I do, and he’s a great guy, and he has the proper native plant for every place," 

Give McGrath credit here for at least acknowledging the existence and expertise of Doug Tallamy, the entomologist whose research has contributed so much to our understanding of the deep interconnection between native plants and the insects they support. You can read whole books bashing native plant advocates, and see no mention of Tallamy. Though McGrath says Tallamy is successful and a great guy, he ignores the implications of his research, and refers to native plants as "hot" and "proper", as if they are a fad, or a dictate being imposed upon us from above.

"but I was just, again, reading a book, and the introduction reminded me, there’s a quote by Jefferson that no man can do more for his country than to introduce a new foreign plant to his farm. The brother gardeners, the founding gardeners, the people who really paved the way, created the idea that we think about horticulture and gardening in America, Jefferson, Adams, Washington, Bartram, all these people they just wanted to throw every plant from every part of the world and see what would thrive here." 

Whoa! Bringing out the founding fathers to support a helter skelter, pell mell introduction of non-native species--that's a new one, to me at least. Here's Jefferson's actual quote, from the Monticello website: "the greatest service which can be rendered any country is to add an useful plant to its culture." The website goes on to say that "Jefferson ranked the introduction of the olive tree and upland rice into the United States with his authorship of the Declaration of Independence. A Johnny Apple seed of the vegetable world, Jefferson passed out seeds of his latest novelty with messiahinistic fervor."

There is, of course, no doubt that the nation's founding fathers had a deep respect for the importance of plants in our lives. It's not a fluke that the U.S. Botanical Garden stands within a stone's throw of the nation's Capitol building--a centrality that seems incongruous today, when the study of plants has become so marginalized.

Many plant introductions have proven useful for agriculture and horticulture, but we now know the risks. Jefferson spoke those words long before the nation's elms, chestnuts, and other species were decimated by imported diseases, long before the multiflora rose escaped cultivation to choke our forests with thorns. McGrath's argument is just one more way of pretending that science hasn't taught us anything about the importance of balance and deep interconnectedness of species in an ecosystem. Presumably, if Jefferson were alive today, he would not own slaves, nor would he be advocating for the unregulated introduction of new species into the country. People and societies are supposed to learn from their mistakes.

"So, native plants have a lot of benefits to native pollinators, but, the world has become such a small place. You probably aren’t going to find many corners of it where there isn’t a plant from every other continent growing in context with the other plants."

Here, McGrath makes no distinction between habitats where native flora have been largely displaced, and habitats where the native flora are largely intact, with minimal disruption from introduced species. There are gradations of disruption of ecosystems, but McGrath seems to think of the whole planet as having lost its virginity, so therefore there must be no indigenous plant communities of value left to preserve. 

"Now, I’m not talking about invasives. Obviously people shouldn’t plant invasives, but I also don’t see invasives being sold at garden centers much, unless you count Bradford pear, you know." 

Here, McGrath at least makes a distinction that is surprisingly hard for some to make. Not all introduced plants exhibit invasive behavior. Now, there are plants that don't begin exhibiting invasive behavior until long after they've been introduced. Unlike native species that have grown in a region for many thousands of years, an introduced species has no track record. Once they begin acting invasively, it's usually too late to stop their spread. Thus, the healthy skepticism towards introducing new species to an area.

"But you have to remember, poison ivy is a native plant. Virginia creeper, one of my most troublesome weeds, is a native plant."

Again, he makes the important distinction that invasiveness is a behavior. In my experience, native cattails can be very aggressive in a wetland. In a small wetland I take care of, we actually remove it so that other species can thrive. But it's also important to remember that the vast majority of invasive plants are introduced, not native. McGrath is obscuring this reality. Virginia creeper can be aggressive in a garden, but I've never seen it become a problem in nature preserves. 

"I know the evils of Japanese honeysuckle. I know what a bad person I am, because it appeared on the fence, in my yard, ten years ago, and my wife was out on the little balcony outside our bedroom one night, and she goes, “I thought the multiflora rose were all done blooming.” And I said, “Yeah, yeah, they’re just a nuisance now.” And she said “What’s that amazing smell?” And I said, “That’s a bad plant. Would you like to taste it?” And she had never as a child gone out and drank the honey of the honeysuckle flower petal, and she goes “Explain to me that this is a bad plant. Why?” Well, supposedly no native butterfly can use it as a host plant, and while we’re out there, there’s like a dozen native bees fighting to get at every flower,"

First off, this is the classic cherry-picking approach. If a plant has one positive trait, or in this case two, then any negative traits magically become immaterial. Apologists for invasive species depend heavily on incomplete characterizations in order to make their arguments seem plausible.

McGrath told a similar story about his wife while praising multiflora rose. Invasive species like Japanese honeysuckle and multiflora rose thrive because the wildlife don't eat them. Their dominating displacement of the more edible native plants means that insects and other animals have diminished options for edible foliage, and even the pollinators feasting on the Japanese honeysuckle flowers will have few options for sustained nutrition once the dominant invasives stop blooming. At least McGrath mentions the need of butterflies for specific host plants, but that acknowledgement comes with a grudging "supposedly", and the story tells of the sinful pleasures to be had while enjoying plants we've been told are bad.

This concept of "good" plants and "bad" plants can hang people up. Here, McGrath has a nice moment with his wife, smelling Japanese honeysuckle and sipping its nectar, and resents having to think of it as a "bad" plant. Consider the possibility that the plant is good, that people are good, but that the main threat to the planet is too much of a good thing, that the balance of species, of CO2 in the atmosphere, and of the planet's capacity to process the biproducts of human activity has been thrown out of whack. 

"and I know there are nice native honeysuckles that are well behaved, that go to bed on time, listen to their parents, get 95s on their report cards, but at least when I was in college girls didn’t want to go out with those guys, you know."

Part of McGrath's popularity comes from his colorful personality and willingness to go big with his opinions, but here he can't help but veer into demogoguery, playing to the crowd at the Philadelphia Flower Show for laughs, while portraying native plants and the science that underscores their value as the sort of good boys and overachievers that the rest of us don't want to hang out with. In the process, he creates a despised "Other", in stark contrast to the pose of open-mindedness he then adopts in the next sentence:

"But, my personal feeling is, I see the good in every plant. I see every plant having some kind of purpose, and so I let almost everything grow on my landscape. If I deliberately tried to plant my landscape, it would look like Yellowstone after a fire, but instead I’ve learned to welcome the stranger, to see what this plant looks like as it grows up. Now, if it’s going to become a tremendously invasive problem, and it’s going to inflict, you know, harm on my neighbor’s property, then I pull it out. But I find that a lot of nonnatives have value,"

Yes, after impuning native honeysuckles as a bunch of boring, conformist, do-gooders that we don't want to spend time with, he then says he sees "the good in every plant." Radio show host, know thyself. This sort of hypocrisy is common in the native plant bashing genre, a hypocrisy most famously captured in the words of songwriter Tom Lehrer, "I know there are people in the world that do not love their fellow human beings and I hate people like that."

The comment about "Yellowstone after a fire" threw me off. I thought at first he meant it as a positive, since fire in a relatively healthy, fire-dependent ecosystem like Yellowstone brings a flush of new and richly diverse plant growth. But more likely, he equates fire with a blackened and barren landscape, as it is portrayed, wrongly, in the news.

"and the saddest part, the saddest truth of what’s happened to this planet is a lot of native plants can’t survive because the climate they thrived in is gone."  

Though the speed of human-caused climate change is creating stress for plants and animals, it's also true that most plant species in the U.S. have very long vertical ranges, often stretching from Georgia up into Canada, across a broad range of hardiness zones. Here's one example, picked at random.

"You know, native when? Native a hundred years ago, two hundred years ago, fifty years ago?"

The "native when" argument, like the view that ecosystems are either virgin or humanized, with no gradation between the two, betrays a dismissiveness towards co-evolution, in which species that live together for thousands of years can develop complex relationships of mutualism and symbiosis. 

But I also encourage people to try to support native plants and learn more about them, and for that I will send you to the work of Dr. Doug Tallamy, at the University of Delaware. He’s a genius in this regard. 

Again, credit McGrath for mentioning Doug Tallamy. McGrath could have saved everyone a lot of time by limiting his answer to this last sentence, and sparing the audience all his bias and misinformation.

Will Princeton's carbon footprint spur action?

Through a generous grant from the Robert Wood Johnson Foundation, Sustainable Princeton has been able to fund a study of Princeton's carbon footprint, that is, how much carbon dioxide, methane and other greenhouse gases we are collectively sending skyward. That number represents the extent to which we as a town are trapped in a carbon economy, and thereby contribute daily to a collective, chemical undermining of nature. The main greenhouse gas, carbon dioxide, plays important positive roles in the earth's atmosphere, oceans, and in delivering to plants the carbon they use to grow, but as in our bodies, a significant change in its concentration can have disastrous consequences.

Few of us pay any notice to the exhaust pipes and chimneys in our lives, even though their emissions are quietly day to day determining our planetary fate. We abuse nature because we see little choice, because everyone else does it, because each individual's contribution seems insignificant, and because we can. Abuse can be inadvertent or, as in the photo of an outsized exhaust pipe in the back of a Dodge Ram pickup truck, a brazen show of power.

I may have been the first to attempt a carbon assessment of Princeton's energy use, in 2011, when I sought data from our energy provider, PSEG, on Princeton's consumption of gas and electricity. At the time, Princeton University was beginning to assess its own energy use, as was Sustainable Lawrence just down the road.

The premise, at least for me, was that awareness of our collective energy use as a town could help spur a move to use less, knowing the catastrophic global consequences of using carbon-based energy. We could compare our energy use year to year, and with other towns in the area, and thereby gain a sense of progress towards a shared goal.

My own experience with a home energy monitor, which displays how much electricity my house is using at any moment, suggested that knowledge is power. If I turned on the electric clothes dryer, our home energy use jumped by 3500 watts. Who knew? That's when we got clothes racks to hang-dry the clothes. A noisy, inefficient fan in the attic was replaced by passive ventilation. Turning off a few unneeded lights made the number drop even further. It was empowering and satisfying. We saved 35% on energy costs in the years that followed, with no loss in comfort or livability.

Immediate feedback seemed key in changing behavior. I dreamed of being able to go to a website where Princeton's energy use would be displayed in real time. Even more fine-grained data would allow neighborhoods to compete to see "how low we could go." But I quickly came up against the technical hurdles. PSEG was only set up to provide data every three months. Determining energy use by town government, or by the school system, required sending PSEG the meter numbers on every building. And then there's all the consumption of gasoline by cars and trucks driving through town. How to assess that?

I was stunned to learn that our town's biggest energy hog may be the incinerator that burns sewage sludge down on River Road. When natural gas prices were high, the town was spending more than one million dollars each year to fuel an incinerator most people don't even know exists. (I bet "Princeton's Finest" could outcompete Milorganite any day, and dramatically reduce our carbon footprint at the same time.)

In 2014 Heidi Fichtenbaum of Sustainable Princeton contacted me, wanting to pick up on my initial work with PSEG to quantify Princeton's energy use. I passed the data to SP's Christine Symington, who attended Hack Nights hosted by Code for Princeton, and sent the following update to me in 2015:

"Your past efforts to get this data were instrumental in getting a conversation started with PSEG that has led to us getting a commitment to getting updated data each quarter. 

We now have the start of a webpage that gives anyone in Princeton the ability to visualize our collective energy consumption. The team working on this included a 7th grader that designed the logo & created the styling for the site. Keep in mind that this is a work in progress. Ideas out there to expand on this include:

• providing an import tool for residents and businesses who opt in to upload their personal utility bill information so it can be collected and used to create a "Princeton" energy consumption profile. This could be used to gather before and after energy costs from homeowners that participated in the EnergySmart Homes campaign 

• an import tool for Sustainable Princeton to upload the data from PSEG easily and dynamically update the site with current usage data

• a map of Princeton that would display energy efficiency or renewable energy implementations 

• scenario builders that would show what Princeton could do to get to a 20% reduction in fossil fuels by 2020, i.e. increase solar installations by x%"

Then, in the fall of 2015, Christine published a report on Princeton's energy use on the SP website, the aim being to identify a baseline of energy use from which to measure Princeton's progress towards reducing energy use 20% by 2020.

Now, a grant-funded professional study should yield the long-sought number for Princeton's carbon footprint.

The big question going forward will be what Princeton does with that number. If we've learned anything in this long struggle to get action on climate change, it's that numbers don't make people change their behavior. The number on my home energy monitor moved me to action only because of a feeling in my gut that it is ethically wrong to be using energy that risks the future of our children, our nation, and a livable planet. How, we must ask, if Princeton is to be an example to the rest of the world, do we plant that feeling of ethical revulsion deep within more than a conscientious few of its residents?

One heartening development over the past year or two has been the growing gut-level rejection of discrimination, sexual harassment, and most recently gun violence. These issues have gone from the level of intellectual and political objection to a cathartic, visceral imperative that such behavior must be purged from society.

The Academy Awards this week was emblematic in its conscious shift towards inclusion and respect. And yet, predictably interspersed throughout that program and many others are car commercials that not only tolerate but glorify our collective chemical abuse of nature.

Our senses, of course, will not help us to reject the daily practice of pouring more and more CO2 into the atmosphere from the underground fuels we burn. Invisible, odorless, it all seems harmless enough. But if we were doing to our closely regulated bodies what we are doing indiscriminately to the earth--raising its temperature, acidifying the waters that sustain its life--we would literally feel in our guts the revulsion necessary to drive change in behavior.

It will be interesting on Wednesday to see the numbers that Sustainable Princeton has come up with, how business, commercial, residential, school and municipal sectors compare, and to see if the numbers are fine-grained enough to help drive decisions that will lead to substantive, measurable change.

Climate change is deceptive on so many levels. It is human nature to cling to the status quo, and yet it is the status quo that now drives radical change that increasingly threatens the lifestyle we wish to preserve. The more we cling, the less control we will ultimately have, as rising oceans claim our cities and super storms devastate communities. Each of us is left to grapple with the personal predicament arising from a collective failure, as in some lines I read at a recent poetry event at the library:

I don't mean to
I don't mean to
I don't mean to be so mean
To the earth.

How I love so much about it
As I travel all about it,
Spewing all that carbon as I go.
Where will I go,
When all that I love so,
When all that I go to,
Is gone?

Pessimists will say that it's already too late, that too much change is already baked into the system. But that is just one more in a long line of convenient excuses for inaction. Ending abusive behavior helps everyone. It not only makes life better for the abused, but also makes the former abuser a better person. Reducing the incredible disrespect for nature embedded in our economy and our culture will free us from an existential predicament we face as individuals every day, and make us better people.

A version of this piece was first published by PlanetPrinceton.com.

Good People Trapped in a Carbon Economy

Most of us were raised to be good people, but we live in an era when it is impossible to be good. Sure, we do all the things that good people would do: drive loved ones to where they need to go, keep the house comfortable, cook dinner, navigate the workaday world, travel to fascinating places. But each one of those life-affirming gestures, try as some might to deny it, is haunted by the collateral damage it causes. It is combustion that enables every one of those actions, and the kind of combustion we do leaves behind a chemical curse, all the more potent for being invisible.

Cars going by, planes flying overhead, steam rising from a chimney--the positive associations of each in the present is polluted in our minds by the dreaded portent for the future, as each person's seemingly insignificant legacy of combustion mixes with tens of billions of others past and present in the atmosphere and oceans, creating a vast chemical and thermal imbalance over time. This is the power of collective action.

It's as if every gallon of gas we buy, and every cubic foot of natural gas delivered silently to our homes, comes with an automatic donation to the End-of-the-World-As-We-Know-It Fund, dedicated to flooding coastal cities, promoting ecological collapse, and destabilizing weather patterns worldwide. Any intentional plot to do such damage would be considered Public Enemy #1. How, then, are we supposed to think ourselves good people without building a wall through our brains to prevent this unintentional harm from invading our awareness?

The inevitable guilt may cause some to trim their personal impact, but it seems paralyzing for most people. Better to feel outrage, at the powerful ideologues, pessimists and political cowards who keep us trapped in a dependency on fuels that power the present by sacrificing the future. This is not freedom, when we are cheated of any positive collective response commensurate with the threat, when we remain little more than conscripts, prodded by car commercials, cultural norms, and enforced economic necessity to collectively sabotage a beloved planet and our children's prospects. 

People think of climate change as an external threat, largely distant in place and time, but I feel it just as much on the inside, aware of the devil's bargain that pollutes any good I might do day to day. 

There was a time when nations were free to collectively counter global threats. We should be even more willing now, proud of sacrifice, challenged to be resourceful rather than extractive, because this time around, no lives need be lost, no war fought--only a rapid disarmament in the insidious chemical war against nature, a shift in habit and technology that squeezes fossil fuels out of our lives. 

This short essay was published in Town Topics on Feb. 21, 2018.