The preconditions for creating an exposition on the botanical and geographical site "Altai" of the Polar-Alpine Botanical Garden of the KSC RAS, represented by cenotic elements characteristic of the forests of the Altai mountains: dark-coniferous, light-coniferous and black taiga. Such expositions in botanical gardens are one of the forms of preserving the biodiversity of introduced plants ex situ. The condition, structure, species composition of the created plantings for this period - the completion of the first stage of work ("Creating a tree tier") is described. Preliminary results of plant introduction the main tree species ( Abies sibirica Ledeb., Picea obovata Ledeb., Larix sibirica Ledeb., Pinus sibirica Du Tour, Pinus sylvestris L., Tilia cordata Mill ., Populus tremula L.) forests of the Altai mountains. The condition of coniferous plants is characterized as normal: they show climate and soil resilience, have a natural rhythm of development here, go through all stages and phases of ontomorphogenesis. A comparative analysis of the rhythms of seasonal development of plants of herbaceous species characteristic of the most contrasting ecotypes of the Altai mountains (foothill and high-mountain) showed that the conditions of the Northern taiga of the Khibiny mountains of the Kola Peninsula are more consistent with plants of high-altitude habitats (high-mountain ecotype). Features of growth and development of plants of Altai species ex situ indicate successful adaptation of most of these species to the conditions of the Kola Arctic.