Abstract
In the years 2000-2011, observations were made of shrubs of the cultivars derived from the Rugosa (<i>R. rugosa</i> Thunb.) gathered in the Collection of Rose Cultivars of the Polish Academy of Sciences (PAS) Botanical Garden - Center for Biological Diversity Conservation (CBDC) in Powsin, Poland, including 29 varieties. In the second part, the results are presented for 17 modern cultivars (‘Bokratrack’, ‘Dart’s Defender’, ‘Handwar’, ‘Hanpur’, ‘Hansno’, ‘Hanuhl’, ‘Korgosa’, ‘Korhassi’, ‘Korruge’, ‘Magsed’, ‘Rokoko’, ‘Speruge’, ‘Strolen’, ‘Stronin’, ‘Thérèse Bugnet’, ‘Uhlwe’, ‘White Grootendorst’). Every year, damage to shrubs caused by frost was recorded; the date of bud break and the date when leaves developed in springtime were recorded; regeneration of shrubs damaged in winter was observed; the dates of initial, full and final flowering were recorded; the presence of disease symptoms was observed; and notes were made concerning the need to do spring pruning and pruning after flowering. The winter seasons 2002/2003, 2005/2006, 2009/2010, 2010/2011 were unfavourable for roses. In terms of the features in question, the cultivars varied. The observations made confirm the high frost resistance of Rugosa hybrids and their low cultivation requirements, owing to which they deserve a wider application, in accordance with their intended use, both as amateur varieties and for urban green areas.
Highlights
In the second half of the 20th century, there appeared a particular need to look for plants which tolerate unfavourable growth conditions, mainly in urban green areas and along transport routes (Latocha, 2002)
In the conditions of central Poland, in the Botanical Garden the cultivars were characterized by different frost resistance
High frost resistance in most of them (Table 2 and 3) encourages their cultivation. In terms of this feature, they considerably surpass numerous Tea Hybrid and Floribunda roses used in flower beds (Czekalski et al 1990) as well as numerous other varieties growing in the conditions of the Botanical Garden in Powsin (Monder, 2004a, 2004b, 2007a, 2007b, 2008a, 2008b, 2010)
Summary
In the second half of the 20th century, there appeared a particular need to look for plants which tolerate unfavourable growth conditions, mainly in urban green areas and along transport routes (Latocha , 2002). Such plants play one of the most important roles in shaping the natural urban space. The increased attractiveness of shrubs of this species results from their long flowering (repeat-flowering) period and ornamental hips. The calculated pollen productivity was 8-14 kg×ha-1 in the most productive cherries and crabapples grown in monocultures, but it was only half of that in some species. Pollen productivity was 3-10 kg×ha-1 but in Rosa rugosa Thunb. up to 20 kg×ha-1 and in R. multiflora Thunb. 15-50 kg×ha-1 (Szklanowska , 1992)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
