The studies were conducted in the arboretum of Si-berian State University of science and technologies named after academician M.F. Reshetnev, having an area of 8 hectares, planted in 1948 on the territory of educational and experimental forestry enterprise and Siberian State Technological University, according to the forest zonation, is located in Central Siberian sub-taiga-forest-steppe area. The climate of the area is se-vere with large annual and daily temperature fluctua-tions. The paper summarizes the results of growth of fallopian trees and one-two-year seed offspring of Mon-golian oak. The description of fallopian biogroups, which selection to the most adapted to the environmental con-ditions according to the plants for further propagation is submitted. Among the trees of uterine height were se-lected instance А598-7, yield В196-3. With these trees and seeds were collected for sowing. The seeds were sown in autumn in transverse furrow by the method of random repetitions. At the end of growing season of 2016, in the plants the height, diameter of the stem at the root neck were measured, the number of leaves was determined. As a result of comparative analysis of vari-ability of annual and biennial seedlings on the height of aerial part of the stem, the diameter of root neck identi-fied the most promising seed offspring for further repro-duction. The biogroups having high and low height, di-ameters were defined. It was also studied the variation in the size of the leaves. To obtain standard planting material, Mongolian oak seedlings should be grown one to three years. Then they should be replaced to the nursery. High decorative qualities of plants allow using them for gardening.