Species evolve, not individuals. Say it with me. Species evolve, not individuals. One more time? Species evolve, not individuals.
Next: Why do plants evolve?
Do you honestly believe that the environments of animals change while plant environments remain exactly the same? Are you trying to tell us that, throughout world history, the environments of plants never changes? How the hell does the animal's environment change, but not that of plants?!?
The meteor that wiped out the dinosaurs had no effect on plants, RR? Volcanoes, no effect on plants? Global climate changes, no effect on plants?
What do you think plants do? They just sit there, happily being eaten by insects and animals - and there's no selection pressure?
Plants are not mobile. They are attacked by insects, viruses, fungi, bacteria and animals. Other plants also parasitize them and plants compete for sunlight. All of these act as selection pressure on plants - just like animals, those that can survive and reproduce better will have their genes represented in higher proportion in the next generation.
Plants produce toxins to deal with insects. Insects evolve around those toxins - but they have to specialize to do so. That's why each plant species almost invariably has an insect species that only eats it. That's why we have the carrot beetle, the tomato worm, etc. Because only those species of insects can get around the plant's toxin defenses to eat it.
But if plants focus on producing too much toxin, they can't divert energy and resources to getting taller and bigger. Then other plants beat them out for the sunlight. This is why, if you look at your garden, some species grow really fast but are eaten more (less poison production), while others grow slowly but are eaten quite a bit less.
In short, plants are competing with other plants and everything that eats them. Their environment changes with each new input - new insect, new plant, new gene in a rival plant, etc.
How are the plants aware enough to compete?
Would you guess that it's autonomic?
How could a plant understand that it's being eaten?
Why haven't plants that are perfect food "evolved" with toxins to prevent eing eaten? ie; potato, tomato, lettuce, basil, parsley, onion, etc,etc...
You've said before that evorution is brought on by necessity, adaptation. Are you now saying that a plant knows what's necessary for survival? A plant is cognisant?