Like what you've read?

On Line Opinion is the only Australian site where you get all sides of the story. We don't
charge, but we need your support. Here�s how you can help.

  • Advertise

    We have a monthly audience of 70,000 and advertising packages from $200 a month.

  • Volunteer

    We always need commissioning editors and sub-editors.

  • Contribute

    Got something to say? Submit an essay.

 The National Forum   Donate   Your Account   On Line Opinion   Forum   Blogs   Polling   About   
On Line Opinion logo ON LINE OPINION - Australia's e-journal of social and political debate


On Line Opinion is a not-for-profit publication and relies on the generosity of its sponsors, editors and contributors. If you would like to help, contact us.


RSS 2.0

When trees have emotions, irrationality takes root

By Allen Greer - posted Friday, 5 October 2018

Wholleben’s views about the fate of “sick” trees in a forest provides a definitive example of how his view of trees as “social beings” fails. He thinks that when a tree becomes sick, healthy trees come to its rescue with nutrients and water via their root connections and mycorrhizal network, because if they ever become sick, they will be supported back to health by the recovered tree through the same means. Wohlleben says “even strong trees get sick a lot over the course of their lives” and “a lot of trees suffer injuries” [emphases added] that can lead to sickness. A little thought, however, suggests that a forest of trees all helping each other out whenever they are impaired will lead to a forest with an increasingly proportion of weak trees. In nature, impairment can be due to a genetic maladaptation and death is the usual consequence. When a tree in a forest goes down for whatever reason, competition among the young trees sprouting in its place is the natural mechanism that provides for the most genetically suitable replacement tree for that time and space - a process that will sum to the “healthiest” forest possible.

Wholleben says, “if every tree were looking out only for itself, then quite a few of them would never reach old age.” But reaching old age is not the point, maximum number of progeny in the next generation is, however achieved.

The long-appreciated theoretical problem of unrelated individuals within species or species among themselves “helping each other out” is that individuals or species that don’t reciprocate gain a short-term advantage (and evolution is only a “from one generation to the next” process), a process that ultimately undermines the altruistic arrangement. The exception that supports the fact is a situation within species in which the “help” is extended to close kin, in which case the individual is still advancing the immediate cause of its own genes. The other exception occurs within highly cognitive beings, such as ourselves, in which individuals who do not reciprocate are recognised and excluded from the benefits of the arrangement.


Wholleben wants us to believe trees share emotions and other attributes that most readers would think only apply to humans. Trees can “agree,” “approve,” “burnout,” “classify,” “count,” “cuddle,” “decide,” assume a “disguise,” “enjoy,” “practice denial,” plan their “futures,” form “intentions,” “give in,” “make mistakes,” “mourn,” ‘panic,” pine unto death, “pull rank,” “realise,” “resent,” “summon,” “take lessons to heart” and take “vows.” They can be “careful,” “cruel,” “forgetful,” “foolish,” “frugal,” “inconsiderate,” “keen” and “stupid.” They feel “anxious,” “bereft,” “desperate,” “malaise,” “relief,” “triumphant” and “unhappy.” They make “vain attempts” and “take advantage” and “precautions.” They have “goals,” “intuition,” “moods,” “positive feelings,” “priorities,” and “realisations.” They have “sex,” “families,” “children,” “aunts,” “uncles,” “buddies” and “friends.” They “help each other out.” And when they die they become a ‘cadaver,” a “corpse.” Throughout, he writes as if trees have volition and intent.

Two examples show how Wholleben deploys his anthroporphisms. Early in the book, he writes, roots are “conceivably… where the tree equivalent of a brain is located. Brain? You ask.” But he immediately qualifies, “Isn’t that a bit farfetched?  Possibly ….” But with that first mention of a brain the reader conjures up an image of the human brain and weds it indelibly with an image of a tree. Toward the end of the book, Wohlleben rebalances with, “large [?] plants do not have brains, ….” But by then, it’s too late. The association has taken root.

Wohlleben refers repeatedly to trees having “mothers.” Even standing alone, there would be no more emotive word than “mother.” But Wohlleben embellishes. He writes of: mothers and their children; “maternal instincts;” mothers “suckling their children,” “nursing their babies;” “mother’s tender care,” mothers not “approving” of their offspring and forests where “tree children can grow up under their mothers.”

Wohlleben said in a New York Times interview, "I use a very human language. Scientific language removes all the emotion, and people don't understand it any more [“any” more? what have we lost?]. When I say, 'Trees suckle their children', everyone knows immediately what I mean." Indeed, they do.

In a Public Radio International interview, he said, “When you pull all the emotions out of facts, no one is interested. It’s time to translate the research for lay people.” Pull the emotions out of facts? Facts don’t come with emotions; its people that attach emotions to them.

As his success has grown, his analogies have become more bizarre. In a May 2017 talk, he was reported by the Guardian as saying, “When you are walking through a forest in winter time you are walking through tree toilet paper,” and as asking rhetorically if killing older trees to make space for younger trees to grow wasn’t similar to killing human parents to make more room in the house for their children. Wohlleben clearly has other than pedagogical reasons for using emotional language and flouting standard usage. In our use of trees, he wishes to “… spare the trees unnecessary suffering…,” and allow at least some of them “… to grow old with dignity….”


He says, “... I suspect we would pay more attention to trees and other vegetation if we could establish beyond doubt just how similar they are in many ways to animals.”

Unwittingly, however, Wohlleben paints himself into a corner in the way he presents his case for a change in the way humans treat trees. Either he believes trees have all the human emotions he ascribes to them or he doesn’t. If he does, then he has deceived his audience about his use of these terms simply to be better understood. If he doesn’t, then his reasons for treating trees as sentient beings vanish.

Further, if Wholleben believes plants have the same emotions as humans, then he has an intriguing evolutionary question to answer. Plants and humans shared a common ancestor 1.6 billion years ago, and that ancestor was a single-cell organism. Wholleben must tell us, therefore, whether that ancestor had all the emotions of present day plants and animals and passed them on to all its descendants to the present day, or whether the two lines leading to plants and humans evolved those emotions independently in the course of their own separate evolution. And if the latter, whether the emotions are likely to be identical, of different, and if different, how he can possibly know what they are.

The public reception of Wholleben and his book is striking because it reveals not only a poor understanding of basic botany and evolution, but most alarmingly, an inability or unwillingness to think critically. Indeed, some reviewers/interviewers have thanked him for demonstrating what they long thought was true. Others have testified they will never again look at a forest in the same way.

The significance of Wholleben’s book is not for any contribution to the practice of forestry, the botany of trees or the welfare of sentient beings, but rather as a document of the gathering Unenlightenment.

  1. Pages:
  2. 1
  3. Page 2
  4. All

Discuss in our Forums

See what other readers are saying about this article!

Click here to read & post comments.

18 posts so far.

Share this:
reddit this reddit thisbookmark with Del.icio.usdigg thisseed newsvineSeed NewsvineStumbleUpon StumbleUponsubmit to propellerkwoff it

About the Author

Allen Greer is a biologist who writes about science and nature.

Other articles by this Author

All articles by Allen Greer

Creative Commons LicenseThis work is licensed under a Creative Commons License.

Article Tools
Comment 18 comments
Print Printable version
Subscribe Subscribe
Email Email a friend

About Us Search Discuss Feedback Legals Privacy