Yacon ( Smallanthus sonchifolius ), a root crop of South American origin, is considerably rich in health-related substances, such as antioxidants and fructooligosaccharides (FOS). To increase the productivity, biochemical value of yacon plants and their resistance to diseases, modern biological preparations, such as growth regulators era recommended. In our work we studied the influence of biological preparations - Albite (Russia) and Lebame (Cuba) on the growth and development of yacon's plants, as well as the content of pigments and antioxidants in the leaves. The use of growth regulators Albite and Lebame, and the use of phytolamp had a positive impact on the increasing intensity of the photosynthetic apparatus and leaf growth biomass of plants yacon.