Eight cultivars of garden pansy were included in the studies: three Delta and Delta Premium cultivars from Dutch firm Syngenta Seeds (S & G) and two Dynamite cultivars from the Japanese firm Sakata. Plants were cultivated in pots in spring-summer cycle using two kinds of medium (peat and coconut fibre) and three fertilizers: a traditional one - Azofoska, and two slow-release fertilizers: Osmocote Plus 5-6 and Polyon. The following morphological traits were evaluated: height and diameter of plants, the number and size of leaves, the number and diameter of flowers, the length of peduncles. It was found that irrespective of the cultivar pansies grew and developed faster on coconut fibre than on the peat. The effect of medium was more obvious at a juvenile stage than at later stages. Slow-release fertilizers Osmocote Plus 5-6 and Polyon significantly increased the number of flowers and the number of leaves per one plant and favourably affected the permanence of decorative value.
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