How Do Plants “Decide” thing like where to grow leaves?

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So I know that “decide” isn’t really the right word, but plants very clearly respond to their environment in a way that is dynamic. They can determine which side of the tree is getting more sun, and put more leaves there. they can determine where there tends to be more water in the soil, and grow more roots in that direction.

Since they don’t have what we would call a nervous system, how is this information processed? There seems to be clear research into the electrical signals moving through the Phloem, but where do these get “processed” in a way that the organism as a whole can make “decisions”?

In: Biology