At what point will we see that plants are conscious, just in a different manner than animals colloquially?
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If you don't understand consciousness, how to make it from first principles and how it works, then I don't think you can confidently say "this isn't conscious" about much.
We don't need to lean on consciousness nor other mysteries at all. Nor we do have to when a rock changes color as it gets wet.
And without this parsimony, then we could claim that any unexplained mystery underlies any well-understood phenomenon which doesn't sound like much of an epistemic standard.
You can observe that a human and a record player can both say "hello", but you can not make the argument from that that there is no way to disprove that a record player might wish to express a greeting to a fellow being.
A simple process can duplicate the outward appearance and effect of a complex one (an mp3 player can talk), and a complex process can duplicate the outward appearance and effect of a simple one (a human can crank a drive shaft), and neither of these means that one might just as well be the other. They don't mean anything at all by themselves either for proving or disproving.
Humans reacting to stimuli in largely similar ways to a plant, or even plain physical process like water filling a vessel or diffusion, neither proves nor disproves, nor even merely implies or suggests, nor even merely opens any doors to any room for doubts about anything.
It could be that there is no fundamental difference between a human and a plant and a toaster, but this observation about similar behavior provides nothing towards the argument.
I find some irony in the mention of elan vital upthread - on the one hand, most people here wouldn't let themselves be caught dead believing in elan vital, but then switch to any thread discussing AI, or even cognition in animals (or plants, like here), and suddenly vitalism becomes the mainstream position once again.