Plant brain

Did you know that trees can talk?

No, they don’t listen to Mozart, and you can’t make them grow taller by talking to them in soft voices. That’s superstition. The truth is far better: they talk in ways we don’t even imagine, without voices, without facial expressions. But they do communicate, in ways we’re only just starting to understand.

When you plant a tree in a pot, it will eventually stop to grow, even if you feed it fertiliser. Why? Don’t trees grow every year? Isn’t that a completely mindless process? Shouldn’t it keep growing until it fills all the space in the pot and then some more, and it starts choking itself to death? Except it won’t. Trees sense the limit of the space they have at their disposal, and will stop of their own accord. They won’t be happy, but they’ll make do, sometimes for years (the tropical fig in my living-room is giving me a nasty stare while I’m writing this, but then I can also sense the limits of the available space and I can’t give it a bigger pot. Sorry, fig). Have you ever wondered why trees grow full and lush when they stand alone in parks, but spindle-thin in a forest, as if they could somehow sense that if they grew as large as they could, they would all tangle together and hurt each other? That’s because they do sense it. And they’re polite. Men who sit on trains with their legs on each side of the wagon could take a lesson from trees.

When a fire starts, some trees can smell it. Cypresses will sense a catastrophe coming, but they know just what to do. They send all the aromatic molecules in their body into the air. That way, when the fire reaches them, it will only meet a bag of water which will be terribly hard ot burn through, as anyone who’s ever tried to start a fire using green wood can attest. But something even better happens. Fires travel in the same direction as the wind, which means that the cloud of molecules will sail ahead. When other cypresses pick it up, they will understand that this is a signal, and that they should get rid of all flamable components, too. As a result of being warned in advance, they will suffer even less damage than the first tree. Trees talk, and they do each other favours, too.

It’s funny how we talk about intelligence. When we talk about humans, we’re all about ‘understanding’, ‘reasoning’, ‘consciousness’, ‘invention’ and so on. When we talk about animals, and even more, plants, we’re still all about ‘instinct’, ‘automatism’, and chemicals and adaptive behaviours and so on. We humans think. The rest of the worlds mindlessly reproduces behaviours and processes that have helped species survive the ages. As if our own thoughts weren’t the result of mingling chemicals, too. As if everything in our bodies had somehow managed to be the result of an evolutionary process, except, for some reason, our intelligence. We’re the annoying special snowflakes of the world. And as a result, we feel it’s okay to slaughter everything else.

Don’t say anything bad about trees. One day, a complex evolutionary process will lead them to produce just the right concoction of chemicals to make them walk up to us on the tip of their roots, strangle us in our sleep and throw a massive party afterwards.


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