A secret suspicion sets her apart from the others. She’s sure, on no evidence whatsoever, that trees are social creatures. It’s obvious to her: motionless things that grow in mass mixed communities must have evolved ways to synchronize with one another. Nature knows few loner trees. But the belief leaves her marooned. Bitter irony: here she is, with her people, at last, and even they can’t see the obvious.
Purdue gets hold of one of the first prototype quadrupole gas chromatography-mass spectrometers. Some pagan god brings the machine right to Patricia, as a reward for her constancy. With such a device, she can measure which volatile organic compounds the grand old eastern trees put into the air and what these gases do to the neighbors. She pitches the idea to her advisor. People know nothing about the stuff trees make. It’s a whole new green world, ripe for discovery.
“How will that produce anything useful?”
“It might not.”
“Why do you need to do this in a forest? Why not the campus test plots?”
“You wouldn’t study wild animals by going to the zoo.”
“You think cultivated trees behave differently than trees in a forest?”
She’s sure of it. But his sigh is as clear as a public service announcement: Girls doing science are like bears riding bikes. Possible, but freakish. “I’ll reserve some trees in the wood lot. It’ll make things easier and save you lots of time.”
“There’s no hurry.”
“Your dissertation. Your time to waste.”
She wastes it with the most intense pleasure. The work isn’t glamorous. It consists of taping numbered plastic bags over the ends of branches, then collecting them at measured intervals. She does this over and over, dumbly and mutely, hour by hour, while the world around her rages with assassination, race riot, and jungle warfare. She works all day in the woods, her back crawling with chiggers, her scalp with ticks, her mouth filled with leaf duff, her eyes with pollen, cobwebs like scarves around her face, bracelets of poison ivy, her knees gouged by cinders, her nose lined with spores, the backs of her thighs bitten Braille by wasps, and her heart as happy as the day is generous.
She brings the collected samples back into the lab and spends hour after tedious hour puzzling out the concentrations and molecular weights, determining which gases each of her trees breathed out. There must be thousands of compounds. Tens of thousands. The tedium makes her ecstatic. She calls it the science paradox. It’s the most brain-crushing work a person can do, yet it can spring the mind enough to see what else but the mind is really out there. And she gets to work in the dappling sun and rain, the stink of humus filling up her nose with relentlessly musky life. Out in the woods, her father is with her again, all day long. She asks him things, and the mere act of asking out loud helps her see. What starts a shelf fungus growing at just a certain height up a trunk? How many square meters of solar panel does a given tree put out? Why should there be such tremendous difference in size between the leaf of a serviceberry and that of a sycamore?
It’s a miracle, she tells her students, photosynthesis: a feat of chemical engineering underpinning creation’s entire cathedral. All the razzmatazz of life on Earth is a free-rider on that mind-boggling magic act. The secret of life: plants eat light and air and water, and the stored energy goes on to make and do all things. She leads her charges into the inner sanctum of the mystery: Hundreds of chlorophyll molecules assemble into antennae complexes. Countless such antennae arrays form up into thylakoid discs. Stacks of these discs align in a single chloroplast. Up to a hundred such solar power factories power a single plant cell. Millions of cells may shape a single leaf. A million leaves rustle in a single glorious ginkgo.
Too many zeros: their eyes glaze over. She must shepherd them back over that ultrafine line between numbness and awe. “Billions of years ago, a single, fluke, self-copying cell learned how to turn a barren ball of poison gas and volcanic slag into this peopled garden. And everything you hope, fear, and love became possible.” They think she’s nuts, and that’s fine with her. She’s content to post a memory forward to their distant futures, futures that will depend on the inscrutable generosity of green things.
Late at night, too tired from teaching and research to work more, she reads her beloved Muir. A Thousand-Mile Walk to the Gulf and My First Summer in the Sierra float her soul up to her room’s ceiling and spin it like a Sufi. She writes her favorite lines in the inside covers of her field notebooks and peeks at them when department politics and the cruelty of frightened humans get her down. The words withstand the full brutality of day.
We all travel the Milky Way together, trees and men. . . . In every walk with nature one receives far more than he seeks. The clearest way into the universe is through a forest wilderness.
PLANT-PATTY becomes Dr. Pat Westerford, a way to disguise her gender in professional correspondence. Her work on tulip trees earns her a doctorate. It turns out that those thick, long lengths of culvert pipe stood on end are factories richer than anyone suspects. Liriodendron has a repertoire of scents. It breathes out volatile organic compounds that do all kinds of things. She doesn’t yet know how the system works. She just knows it’s rich and beautiful.
She lands a postdoc at Wisconsin. She searches Madison for relics of Aldo Leopold. She looks for the towering black locust, with its fragrant racemes and pea-pod seeds, the tree that stunned Muir into becoming a naturalist. But the world-changing locust was cut down twelve years before.
The postdoc turns into an adjunct position. She makes almost nothing, but life requires little. Her budget is blessedly free of those two core expenses, entertainment and status. And the woods teem with free food.
She starts to examine sugar maples, in a forest east of town. Her breakthrough comes as breakthroughs often do: by long and prepared accident. Patricia arrives in her copse on a balmy day in June to find one of her bagged trees under full-scale insect invasion. At first it seems that the last several days of data are ruined. Improvising, she keeps the samples from the damaged tree, as well as several nearby maples. Back in the lab, she widens the list of compounds she looks at. Over the next few weeks, she finds something that even she isn’t ready to believe.
Another nearby tree gets infested. She measures again. Again, she doubts the evidence. Fall begins, and the leaves of her complex chemical factories shutter and drop to the forest floor. She battens down for the winter, teaching, double-checking her results, trying to accept their crazy implications. She wanders the woods, wondering if she should publish or run the experiment for another year. The oaks in her forest shine scarlet still, the beeches a stunning bronze. It seems wise to wait.
Confirmation comes the following spring. Three more trials, and she’s convinced. The trees under attack pump out insecticides to save their lives. That much is uncontroversial. But something else in the data makes her flesh pucker: trees a little way off, untouched by the invading swarms, ramp up their own defenses when their neighbor is attacked. Something alerts them. They get wind of the disaster, and they prepare. She controls for everything she can, and the results are always the same. Only one conclusion makes any sense: The wounded trees send out alarms that other trees smell. Her maples are signaling. They’re linked together in an airborne network, sharing an immune system across acres of woodland. These brainless, stationary trunks are protecting each other.
She can’t quite let herself believe. But the data keep confirming. And on that evening when Patricia finally accepts what the measurements say, her limbs heat up and tears run down her face. For all she knows, she’s the first creature in the expanding adventure of life who has ever glimpsed this small but certain thing that evolution is up to. Life is talking to itself, and she has listened in.
She writes up the results as soberly as she can. Her report is all chemistry, concentrations, and rates—nothing but what the gas chromatography equipment records. But in her paper’s conclusion, she can’t resist suggesting what the results spell out:
The bioche
mical behavior of individual trees may make sense only when we see them as members of a community.
Dr. Pat Westerford’s paper gets accepted by a reputable journal. The peer reviewers raise their eyebrows, but her data are sound and no one can find any problems except common sense. On the day the article appears, Patricia feels she has discharged her debt to the world. If she dies tomorrow, she’ll still have added this one small thing to what life has come to know about itself.
The press picks up on her findings. She does an interview for a popular science magazine. She struggles to hear the questions over the phone and stumbles with her answers. But the piece runs, and other newspapers pick it up. “Trees Talk to One Another.” She gets a few letters from researchers across the country, asking for details. She’s invited to speak at the midwestern branch meeting of the professional forestry society.
Four months later, the journal that ran the piece prints a letter signed by three leading dendrologists. The men say her methods are flawed and her statistics problematic. The defenses of the intact trees could have been activated by other mechanisms. Or these trees might already have been compromised by insects in ways she didn’t notice. The letter mocks the idea that trees send each other chemical warnings:
Patricia Westerford displays an almost embarrassing misunderstanding of the units of natural selection. . . . Even if a message is in some way “received,” it would in no way imply that any such message has been “sent.”
The short letter contains four uses of the word Patricia and no mention of Doctor, until their own signatures. Two Yale professors and a name chair at Northwestern, versus an unknown adjunct girl at Madison: No one in the profession bothers trying to replicate Patricia Westerford’s findings. Those researchers who wrote her for more information stop responding to her letters. The newspapers that ran the wide-eyed articles follow up with accounts of her brutal debunking.
Patricia goes through with her scheduled talk at the midwestern forestry conference, in Columbus. The room is small and hot. Her hearing aids howl with feedback. Her slides jam in the carousel. The questions are hostile. Fielding them from behind the podium, Patricia feels her old childhood speech defect returning to punish her for her hubris. For the three agonizing days of the conference, people nudge each other as she passes them in the halls of the hotel: There’s the woman who thinks that trees are intelligent.
Madison doesn’t renew her lectureship. She scrambles to line up a job elsewhere, but it’s too late in the season. She can’t even get work washing glassware for some other researcher. No other animal closes ranks faster than Homo sapiens. Without a lab to use, she can’t vindicate herself. At thirty-two, she starts substitute teaching in high schools. Friends in the field murmur in sympathy, but none goes public to defend her. Meaning drains from her like green from a maple in fall. After long weeks in solitude replaying what happened, she decides it’s time to shed.
She’s too cowardly to give in to the scenarios that play in her head most nights as she tries to fall asleep. The pain prevents her. Not hers: the pain she’d inflict on her mother and brothers and remaining friends. Only the woods protect her from undying shame. She tramps the winter trails, feeling the thick, sticky horse chestnut buds with her frozen fingers. The understory fills up with tracks like longhand accusations scribbled on the snow. She listens to the forest, to the chatter that has always sustained her. But all she can hear is the deafening wisdom of crowds.
Half a year passes at the bottom of a well. One bright blue crisp Sunday morning in high summer, Patricia finds several unexpanded caps of Amanita bisporigera under a stand of oak in the bottomlands of Token Creek. The fungi are beautiful, but take forms that would make the old Doctrine of Signatures blush. She gathers them in her mushroom bag and brings them home. There, she cooks up a Sunday feast for one: chicken tenderloins in butter, olive oil, garlic, shallots, and white wine, all seasoned with just enough Destroying Angel to shut down both her kidneys and her liver.
She sets the table and sits down to a meal that smells like health itself. The beauty of the plan is that no one will know. Every year, amateur mycologists mistake young A. bisporigera for Agaricus silvicola or even Volvariella volvacea. Neither her friends nor family nor former colleagues will think anything but this: she was wrong in her controversial research, and wrong in her choice of fungal fruiting bodies for her dinner. She brings the steaming forkful to her lips.
Something stops her. Signals flood her muscles, finer than any words. Not this. Come with. Fear nothing.
The fork drops back to the plate. She rouses as from sleepwalking. Fork, plate, mushroom feast: everything turns, as she watches, into a fit of madness, lifted. In another heartbeat, she can’t believe what her animal fear was willing to make her do. The opinion of others left her ready to suffer the most agonizing of deaths. She runs the entire meal down the garbage disposal and goes hungry, a hunger more wonderful than any meal.
Her real life starts this night—a long, postmortem bonus round. Nothing in the years to come can do worse than she was ready to do to herself. Human estimation can no longer touch her. She’s free now to experiment. To discover anything.
Then several missing years. From the outside, yes: Patricia Westerford disappears into underemployment. Sorting storeroom boxes. Cleaning floors. Odd jobs leading from the Upper Midwest through the Great Plains toward the high mountains. She has no affiliation, no access to equipment. Nor does she try for lab positions or teaching stints, even when former colleagues encourage her to apply. Pretty much all her old friends add her to the roster of science roadkill. In fact, she’s busy learning a foreign language.
With few claims on her time and none on her soul, she turns back outside, into the woods, the green negation of all careers. She no longer theorizes or speculates. Just watches, notes, and sketches into a stack of notebooks, her only persistent possessions aside from clothes. Her eyes go near and narrow. She camps out many nights with Muir, under the spruce and fir, completely lost, turned wildly around by the smell of inland oceans, sleeping on beds of thick lichen, sixteen inches of brown needle pillow, the living earth beneath her bag, its fluid influence rising up into the fiber of her and all the towering trunks that surround and watch over. The particle of her private self rejoins everything it has been split off from—the plan of runaway green. I only went out for a walk and finally concluded to stay out till sundown, for going out, I found, was really going in.
She reads Thoreau over wood fires at night. Shall I not have intelligence with the earth? Am I not partly leaves and vegetable mould myself? And: What is this Titan that has possession of me? Talk of mysteries!—Think of our life in nature,—daily to be shown matter, to come in contact with it,—rocks, trees, wind on our cheeks! the solid earth! the actual world! the common sense! Contact! Contact! Who are we? where are we?
Now she drifts farther west. It’s amazing how far a little war chest will go, once you learn how to forage. This country is awash in food free for the eating. You just need to know where to look. She glimpses her own face once, while splashing water on it in the bathroom of a service station near a national forest in a state where she’s the merest beginner. She looks marvelously weathered, old beyond her years. She has gone to seed. Soon she’ll start to scare people. Well, she has always scared people. Angry people who hated wildness took away her career. Frightened people mocked her for saying that trees send messages to each other. She forgives them all. It’s nothing. What frightens people most will one day turn to wonder. And then people will do what four billion years have shaped them to do: stop and see just what it is they’re seeing.
On a late fall afternoon she pulls her ancient beater over to the side of the road along a stretch of the Fishlake Scenic Byway, on the western edge of the Colorado Plateau in south-central Utah. She has followed back roads from Las Vegas, capital of clueless sinners, toward Salt Lake, capital of cunning saints. She gets out of the car and walks up into the trees on the crest west of the road. Asp
ens stand in the afternoon sun, spreading along the ridge out of sight. Populus tremuloides. Clouds of gold leaf glint on thin trunks tinted the palest green. The air is still, but the aspens shake as if in a wind. Aspens alone quake when all others stand in dead calm. Long flattened leafstalks twist at the slightest gust, and all around her, a million two-toned cadmium mirrors flicker against righteous blue.
The oracle leaves turn the wind audible. They filter the dry light and fill it with expectation. Trunks run straight and bare, roughed with age at the bottom, then smooth and whitening up to the first branches. Circles of pale green lichen palette-spatter them. She stands inside this white-gray room, a pillared foyer to the afterlife. The air shivers in gold, and the ground is littered with windfall and dead ramets. The ridge smells wide open and sere. The whole atmosphere is as good as a running mountain stream.
Patricia Westerford hugs herself, and, for no reason, begins to cry. The tree of the Navajo sun house chant. The tree Hercules turned into a wreath, the one he sacrificed, when coming back from hell. The one whose brewed leaves protected native hunters from evil. This, the most widely distributed tree in North America with close kin on three continents, all at once feels unbearably rare. She has hiked through aspens far north into Canada, the lone hardwood holdout in a latitude monotonous with conifer. Has sketched their pale summer shades throughout New England and the Upper Midwest. Has camped among them on hot, dry outcrops above gushing streams of snowmelt, in the Rockies. Has found them etched with knowledge-encoded native arborglyphs. Has lain on her back with her eyes closed, in far southwestern mountains, memorizing the tone of that restless shudder. Picking her way across these fallen branches, she hears it again. No other tree makes this sound.
The aspens wave in their undetectable breeze, and she begins to see hidden things. High up on one trunk, she reads claw-gashes above her head, the cryptic writing of bears. But these slashes are old and rimmed with blackened scars; no bears have crossed these woods in a long time. Tangled roots spill from the banks of a rivulet. She studies them, the exposed edge of a network of underground conduits conducting water and minerals across dozens of acres, up the rise to other, seemingly separate stems that line the rocky outcrops where water is hard to find.
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