The theoretical basis for the introduction of plants includes acclimatization, which is the expression of adaptive, dynamic and complex changes and which can be highlighted at the population’s genetic level. The introduction of plants is a field of scientific research that develops theoretical bases and methods of breeding, mobilization and cultivation of exotic plants under new pedoclimatic conditions, studies their response to changes in environmental factors and gives an analytical appreciation of the results of introduction. Introduction is a continuous, unique, integral process that takes place under the conditions of cultivation under the direct influence and active involvement of man. The process of introduction consists of three key steps: mobilization, adaptation and use. Acclimatization and naturalization are not human activities or methods of influence, but they are complex processes of adaptation that take place in the body of plants under the influence of environmental factors under man-made artificial conditions. Acclimatization and naturalization are states of the plant population at a given moment, under the new pedoclimatic conditions.