Crown shyness (

307 points by unsupported 339 days ago


slackingoff2017 339 days ago

Another crown phenomenon

And something that prevents many trees from being grown indoors

Trees will lead you down a glorious wikipedia black hole.

donatj 338 days ago

This is super interesting. This is the kind of thing I enjoy on HN most, oddly.

    zone411 338 days ago

    You might want to check out "The Hidden Life of Trees: What They Feel, How They Communicate" by Peter Wohlleben. It's an enjoyable book that covers similar topics, also available as an audiobook.

tptacek 339 days ago

Perhaps somebody else here listens to the Slate politics podcast, where John Dickerson this week spent 4 minutes describing this phenomenon.

roceasta 339 days ago

>Plants are able to sense the proximity of neighbors by sensing backscattered far-red (FR)

Plants can see? I had no idea.

    Mz 339 days ago

    They also can "scream" by giving off a pulse (that humans can't hear) when attacked and can "talk" to each other by giving off chemicals when attacked by insects, thereby warning neighboring relatives to start creating protective chemicals to defend themselves.

      thomasfoster96 338 days ago

      > They also can "scream" by giving off a pulse (that humans can't hear) when attacked...

      Do you have a source for the ‘scream’ phenomenon?

      I am aware of (and was myself misled by) several pop-science books which confusingly tried to compare plants giving off chemicals when attacked with animals screaming. The result was that a skim read would have given one the impression that plants could make sounds inaudible to humans, which was not what was meant.

        Mz 338 days ago

        Sorry, no. It was in a textbook from a college class some years ago. I no longer have the textbook and can't tell you more than that.

      wybiral 339 days ago

      I will never again feel safe in the woods.

        Mz 339 days ago

        I stopped obsessing about the supposed morality of eating meat after I learned these things. Just because you can't hear your veggies scream doesn't mean they aren't suffering.

        (There are lots of really good reasons to limit meat consumption. But, the touchy-feely appeal to "think about the suffering of the animals" is species-ist (for lack of a better word).)

          ocb 338 days ago

          This is getting very off topic, but I think that's a terrible basis for disregarding the ethical argument against eating meat. Why is it "species-ist" to think that mammals and other animals with highly developed nervous systems might have a conscious experience similar to our own (and not plants)?

            joaomacp 338 days ago


            Oh sorry my cat just wanted to comment on this. Hope it doesn't get downvoted for not being relevant, because he has a 'conscious experience similar to our own'...

          harryjo 338 days ago

          The same argument leads a rational person to stop obsessing about the supposed morality of killing humans. The touchy-feely appeal to "think about the suffering of the _humans_" is likewise species-ist

            jpttsn 338 days ago

            So the rational path takes us to a horrible conclusion. Are you saying it's time to throw out rationality?

              qguv 338 days ago

              I think they're saying that you may have thrown out the baby with the bathwater. If your conclusion horrifies you—doesn't resemble what you were optimizing for—you may be optimizing for the wrong thing. Rationality isn't broken; revisit your optimization criteria. See the paperclip optimizer, the smiles optimizer, etc.

magic_beans 339 days ago

Wow! The gaps look extraordinary. What a weird thing to learn about today!

    andirk 338 days ago

    Looks cool, but didn't you learn that we don't know?

      nebabyte 338 days ago

      He didn't say anything to the contrary.

wyldfire 339 days ago

What an interesting phenomenon! Thanks for sharing.

colordrops 339 days ago

Not sure why but this phenomenon is extremely pronounced while tripping on LSD.

    arkis22 338 days ago

    An easy answer would be that everything is more pronounced while tripping on LSD

      randyrand 338 days ago

      the absence of the phenomenon is not more pronounced.