The theme of this thesis is to study the influence of soil conditioners on growth characteristics of newly planted trees. Thesis is the introduction of the theoretical part focuses on this topic. They included topics related to soil conditioners. The main basis for their use, basic soil properties and sorting improving products commercially available and their comparison, below are described using examples and experiences from scientific and academic experiments. In the first is a set of comprehensive knowledge on this topic. The second part is practical, about research. The survey examined the effect of three products (TerraCottem, Agrosil LR, Hydrogel) on the growth characteristics of newly planted trees over one year. They were evaluated results of this survey. At the conclusion is guided discussion of the theoretical and practical parts of a given conclusion about the use of these products in practice.