We don't have to read The Secret Life of Plants to know that our plants talk to us. They speak many languages: Nature, Cultivation, Habitat, and Whimsy, to name a few. Here are some examples. In the words of Nature, my plants, along with the scent of soil and sap, exude, "You're outdoors now!" If my tree's leaves turn yellow, I receive a message about its fertilizer needs, then read up on how to fix it.