The paper studies the effect of applying different doses of slow disintegrating fertilizer 'Scotts' ( Osmocote Exact ) of the formulation 15:9:9:MgO + Me to the quality of impatiens seedlings. The impatiens' seedlings were produced in poly-styrene containers ( speedling system ) and poly-propylene pots ( pot system ). During the seedlings' production, the fertilizer was added in different doses (0, 1, 2, 3, and 4g/l ). The obtained results have shown that the dose of 4 g/l of fertilizer significantly influences on the qualitative features of the impatiens' seedlings.