When we talk about growing cannabis, most growers immediately think of fertilizers, LEDs, or genetics. However, there's a much quieter (and more decisive) factor that acts in every phase of cultivation: plant hormones, also known as phytohormones. These invisible molecules are truly responsible for whether a plant grows tall or compact, whether it branches more or less, how it responds to stress, or even how and when it flowers. Hormones control the development of cannabis plants. We could say, without exaggeration, that hormones are the internal language of cannabis, a network of chemical signals that coordinates every vital process. Understanding them not only brings us closer to better comprehending the plant, but also allows us to make much more precise and efficient growing decisions. And this is where things get really interesting: it's not about adding miracle products, but about learning to interpret how the plant responds to what we do... but what are these hormones really and what role does each one play?