It says so, right here on the Internet itself! So it must be true, right?
No. They are not. One of the countless evidences of this is the fact that no tree has published a study demonstrating that humans have evidence of intelligence comparable to trees, nor a study on anything else. Only humans undertake to project on to utter silence their own thoughts and feelings and, when challenged, say things like, “You can’t prove it isn’t true”.
I don’t have to prove it isn’t true. You have to prove it is. And the evidence is pretty thin on the ground.
“Oh yeah? Well define ‘intelligence’, Mr. Smart Guy!”
I will, for the purposes of our discussion here, define intelligence as having at least some tiny interest in or ability to perceive intelligence. So, for instance, I will grant that both the cat and the mouse have some sort of intelligence since you need to have a bit of smarts to ask, “How do I catch and eat me that mouse?”, just as you likewise need some intelligence to try to outwit the cat who wants to eat you. But neither cat nor mouse have the slightest interest in ever defining the question “How do you define ‘intelligence’?” That’s because neither are as smart as humans, who long ago caught and domesticated both of them, who can code their entire genome without breaking a sweat, and who, alone in the known universe ever so much as bother defining “intelligence”.
But plants? No. They are not “intelligent” and they are absolutely not “as intelligent” as humans.
We are a species alone in the known physical universe in our magnitude of intelligence and imagination–and spend part of that intelligence and imagination projecting our sentience on to non-sentient things. Angels possess intelligence, according to revelation, but we seldom encounter them and only know what revelation tells us about them, which is not a great deal. No creature on this earth is “just as intelligent” as homo sapiens. That’s not arrogance. It’s just fact.