How do plants communicate?

I'd love to help you explore the incredible, silent conversations happening all around us in the green world! Before we dive into the underground networks and airborne signals, I'd love to learn a little more about you so I can make this session as fun and relevant as possible.

What sparked your interest in plant communication, and how much background do you already have in botany or biology?

I'm an advanced gardener or student looking for a deep dive.

It is great to have an advanced gardener and student here! Since you already have a strong foundation, we can skip the basics and dive straight into the fascinating, complex molecular and physical machinery that plants use to sense and respond to their world.

Your path

Chemical Warfare and Signaling (VOCs)

Underground Networks (The Wood Wide Web)

Electrical and Mechanical Signaling

Deconstructing Plant Communication

To understand how plants communicate, we first need to clear away a common misconception: plants do not have a , nor do they need one. Instead of relying on specialized neural networks, plants coordinate their entire bodies and interact with their neighbors using three distinct, overlapping signaling systems:

Biochemical signaling: The release of specialized liquid or airborne chemical compounds.
Electrical signaling: Rapid shifts in cellular membrane potential that travel across tissue.
Physical signaling: Real-time changes in internal fluid pressure and mechanical tension.

The Three Communication Domains

These three signaling systems operate across three highly distinct environmental scales, or "domains":

Intra-organismic: Communication that happens strictly within a single plant (such as a root system telling the leaves upstairs that the soil is drying out).
Inter-organismic: Communication between different individual plants, or between a plant and another species (like emitting airborne scents to summon predatory wasps to eat invading caterpillars).
Meta-organismic: Highly intimate, multi-species communication networks, particularly the intricate chemical negotiations that take place underground between plant roots, soil bacteria, and vast fungal webs.

Let's start by looking closely at how a single plant talks to itself. How do you think a signal physically travels from a plant's roots all the way up to its highest leaves when water gets scarce?