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Living things have always had to make their way in a wild garden of flowers and vines, of leaves and trees and fungi that hold out not only nourishing things to eat but deadly poisons, too. Nothing is more important to a creature’s survival than knowing which is which, yet drawing a bright line through the middle of the garden, as the God of Genesis found, doesn’t always work. The difficulty is that there are plants that do other, more curious things than simply sustain or extinguish life. Some heal; others rouse or calm or quiet the body’s pain. But most remarkable of all, there are plants in the garden that manufacture molecules with the power to change the subjective experience of reality we call consciousness.
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