Apple-tree is a widespread, valuable and avail-able fruit crop. Fruits of apple-tree are rich in vita-mins, biologically active agents and pectin. The replenishment of a gene pool of new winter hardy, productive and early-ripening varieties of fruit crops in Siberia is very important, but insufficiently stud-ied. The data on studying of various grades of ap-ple-trees growing on the collection site of Botanical garden named after Vs.M. Krutovsky are given in the study. The results of fructification of apple-tree are given; the grades and specimens leading in quantity and fruit mass are allocated. The obtained data are used in cultivation of vegetative posterity for the purpose of receiving the most perspective grades. The analysis of features of seasonal devel-opment of the apple-trees growing on a collection site of the Botanical garden was provided to vege-tative periods of 2011-2015. The phenophases differing in the greatest individual variability among the trees of various grades were established. The grade and biotypes with early end of vegetation allowing allocating early- and late-dismissed grades and separate biotypes were selected. It was estab-lished that early beginning and the end of vegeta-tion were reliable signs of rather high winter hardi-ness of wood plants; late beginning and completion of vegetation indicate their low winter hardiness. Supervision over apple-trees of different grades during the five-year period allowed establishing variability on phenology, fineness of fruits, produc-tivity and frequency of fructification. The perspec-tive grades and biotypes recommended for cultiva-tion in an open form in sharp climatic conditions of Siberia are allocated. These researches can be used in cultivation of vegetative posterity for the purpose of receiving productive varieties in sharply continental conditions of Siberian region.