Skilled-industrial cultures of a sessile oak, created in the spring of 2002, were pawned by platforms in the sizes 3x3 m under flat a derivative forest stand submitted by a hornbeam. The investigated variants differed that in one case preparation of ground was carried out in platforms, and in the friend are not present. In platforms where the ground was not processed, and also on those where preparation of ground was carried was spent, landed according to the certain circuits of accommodation of landing places annual sapling (on 25, 16 and 9 pieces on a platform). Research has been carried out with the purpose of a substantiation of influence of preparation of ground on speed of growth in height at a sessile oak. It is revealed, that from 2-th year of a life preparation of ground and caring had, positive influence on speed of growth sapling an oak in height in comparison with their growth on a site where preparation of ground was not made. As a whole, sapling an oak has shown insignificant growth in height. Weak growth in height sapling an oak has affected: process of transplantation and insufficient illumination sapling which were under a large forest.