Yes, even plants talk to one another, although we as humans have a bit of trouble understanding them. (It's not even as clear as your dog "talking" to you when he wants a treat or to go outside.) However, scientists are clarifying the methods by which plant cells communicate and send signals and warnings to one another. Find out how plasmodesmata are involved in plant cell signaling and molecule movement.
Photo: Plasmodesmata in plant cells. Jackacon.