Evaluation of flower decorativeness of floribunda rose varieties by biological and morphological features

The decorative value of roses is determined by a combination of morphological and biological features and characteristics of each variety. Among others, the rose flower is of central decorative importance. Floribunda rose varieties are known for their wide range of shapes, colours and aromas, which make them a valuable material for landscaping using. The study of biological and morphological characteristics of the flower of 10 floribunda rose varieties was carried out at the experimental plots of the Department of Landscape Gardening of the Uman National University of Horticulture in 2019- 2023. It was determined that the flowers of the studied floribunda rose varieties differ significantly in such indicators as colour, diameter and terryness. It has been studied that the flower diameter of floribunda rose genotypes ranges from 5.3 cm in «Lavaglut» variety to 8.0 cm in «Novalis» variety. The vast majority of varieties are classified as densely double («Hans Gonewein», «Let’s Celebrate», «Lovely Green», «Novalis», «Pomponella» and «Rotkappchen») with the number of petals ranging from 41.7 to 117.4 pcs. Two varieties have semidouble («Carmagnola» and «Westpoint») and two double («Iceberg» and «Lavaglut») flowers. The «Rotkappchen» variety has the largest number of petals and is distinguished by its rosette shape. Particular attention is drawn to the densely double spherical flowers of the «Lovely Green» and «Pomponella» varieties and the perfect cup-shaped tea-hybrid flower of the «Novalis» variety. A wide range of colours of floribunda roses allows you creating bright floral arrangements with their help. Today the varieties of rare orange («Westpoint») and purple («Novalis») colours are particularly valuable. Thus, it was found that floribunda group rose varieties are characterised by wide variability in decorative flower characteristics, which allows to use them in various types of flower plantations. Key words: roses, floribunda group, flower, colouring, decorativeness, landscaping.