The purpose of my bachelor thesis was to monitor the formation of flower bunches and individual flowers in the first year after transplanting mature roses (Rosa spp.) In February 2017 five years old rose plants were transplanted from the horticultural centre of Biotechnical Faculty in Bilje to a location nearby Biotechnical Faculty in Ljubljana. Different rose groups were included in the monitoring: groundcover roses (3), floribundas (4), climbing roses (4), ramblers (4) and standard roses (3). Measurements were performed on three plants of each cultivar on 4 dates: May 31st, June 17th, June 31st and July 17th -of. The following measurements were performed: the number of flower bunches on individual plants, the number of flowers in a flower bunch, the length of flower stalk and the diameter of flowers. Flowering characteristics were compared among different groups and cultivars. Ramblers developed the most flower bunches on the first date (37,2), groundcover roses on the second and third date (26,9 and 4,8) and standard roses on the last date (3,9). The lowest number of flower bunches was recorded in the group of standard roses on the first two dates (6,1 and 4,2) and in the group of climbing roses on the third and fourth date (0,1 and 0,3). The highest number of flowers in the flower bunch was measured in ramblers on the first date (45,6) and groundcovers on all other dates (31,2; 6,9 and 4,0). Standard roses developed the least flowers in the flower bunch irrelevant of the date (2,9; 1,5; 1,2 and 1,3). The longest flower stalk was measured in ground cover roses on the first and third dates (49,8 and 43,7 cm), and climbing roses on the second and fourth date (62,2 and 14,3 cm). The shortest flower stalk was observed in standard roses on the first and second date (20,6 and 8,9 cm), and in floribundas on the third and fourth data (6 and 15,7 cm). The largest flower diameter was recorded in standard roses on the first and last date (79,7 and 88 mm) and in climbing roses on the second and third date (75,2 and 62,3 mm). The smallest flower diameter was observed in ramblers on the first date (49,4 mm), groundcover roses on the second and third date (40,1 and 45,9 mm). On the last date only climbing (77,8 mm) and standard roses (88 mm) still developed flowers. We can conclude that roses from all groups, with the exception of standard roses, continued their generative growth in the first year after transplanting mature plants.
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