The thesis deals with an evaluation of the impact of planting term and the use of the support preparations for survival and growth of bareroot and containergrown seedlings of European beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) Karst. The experiment was carried out on a research area that was based on an area in 2014 after a wind calamity in the Javorie Mountains. The results are processed after the 3rd vegetation period since the establishment of the research area. Planting was carried out in spring and autumn, and bareroot and containergrown seedlings of both plants were used. The effects of preparations - the Stockosorb® hydrogel and the Sylvamix® fertilizer were monitored. Stockosorb® . Values such as height gain, stem size, seed height and depth, active, inactive and not mycorrhizal rootstocks, overhead and underground mass, weight of whole seedlings, survival and damage (game, mechanically, physiologically). By comparing the survival and growth results, the Norway spruce values were better. . Of all the variants, the spring term was the best result in survival, the impact of the Stockosorb hydrogel was only seen in containergrown seedlings of European beech. The bareroot and containergrown Norway spruce seedlings with the added Silvamix fertilizer reached the highest height (92.28 / 73.29 cm), the thickness (16.36 / 11.27 mm) and the stalk volume (15.90 / 9.89 cm3) after the third growing season . The impact of the Silvamix fertilizer on the European beech seedlings was less pronounced and the bareroot seedlings reached a height of 61.71 cm and a growth of 16.08 cm, with no significant impact of the fertilizer on the containergrown seedlings. The beneficial effect of the fertilizer was also found on the total weight of the Norway spruce, both in the containergrown (132.69 g) and the bareroot (53.20 g) seedlings. During the evaluation of the mycorrhization of the root system in our experiment, the proportion of active mycorrhizals moved above the 81% of the total number of fine nutrient roots.