Plants have memory, just like animals. Although they lack a nervous system or brain, they have the remarkable ability to record, integrate, and remember signals from their environment. This plant memory allows them to finely adjust their physiological, biochemical, and morphological responses to abiotic and biotic stresses, ensuring their survival and adaptation in environments subject to variable and often severe environmental stresses. This memory, known as environmental memory, is based on a complex combination of molecular, epigenetic, and metabolic mechanisms that give plants a form of "adaptive plasticity." By retaining traces of past events such as drought, salt stress, pathogen attack, or light variations, plants optimize their future responses, sometimes over several generations. Far from being passive, plant memory is a silent, subtle, and effective ecological strategy through which plants regulate their development and interact with their environment.