Light can tell us many things! Spectrometers can tell us the temperature of distant stars. What they are made of. How fast they are moving. In fact light teaches us about the universe. Why couldn't plants carry light information? Intensity, direction...etc. We share a great deal of DNA with plants.
Since Japanese scientists showed that humans actually emit photons from our bodies, perhaps plants can recognize individuals as well.
Everything is alive!
Did you know that the bred offspring of a bioengineered plant and a standard plant variant are considered organic under USDA rules? Keen!
Now what can I eat?