Abstract: A vegetation experiment was carried out in the years 2006 and 2007, with Clematis from Jackmanii group, cultivar ‘John Paul II’. Two types of multicomponent fertilizers with slowed down action from Osmocote Exact group were used: Osmocote Exact Hi-Start and Osmocote Exact Standard. Influence of these fertilizers was studied on growth and yielding of Clematis ‘John Paul II’. The longest shoots of Clematis were obtained after the application to the substrate of Osmocote Exact Hi-Start and Osmocote Exact Standard fertilizers in the dose of 8 g∙dm^-3. Plants fetrilized with Osmocote Exact Hi-Start obtained the highest weight of their above ground plant parts at the dose of 8 g∙dm^-3 of substrate, while plants fertilized with Osmocote Exact Standard obtained the highest weight of their aboveground plant parts at the dose of 6 g∙dm^-3 of substrate. Plants in a 5-month period of growing with the application of the fertilizers Osmocote Exact Standard did not show any signs of mineral malnutrition. The greatest number of flowers and the greatest weight of flowers was found in plants grown in the substrate with an addition of the fertilizer Osmocote Exact Standard in the dose of 6 g∙dm^-3. The best fertilizer for the growing of Clematis ‘John Paul II’ cv. has shown to be Osmocote Exact Standard in the dose of 6 g∙dm^-3.

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