Growth and development of representatives of the genus Rosa L. in the Stavropol Botanical Garden

Relevance . To identify the features of growth and development species roses different geographical origin, to establish biological minimum temperatures necessary for beginning flowering representatives genus Rosa L., study morphological indicators fruits. Methodology The research material was 12 wild belonging 4 sections: Canina Crep, Cinnamomeae DC, Luteae Pimpinellifoliae DC. carried out using methods Main Botanical Garden, floral analyses — according Hrzhanovsky. A caliper used measure length diameter 10 For analysis statistical data, MS Excel table processor integrated MATLAB mathematical package were used. Results article presents results a in Stavropol Garden various origin. involved sections. plants new soil climatic conditions are revealed. dates main phenological phases andtheir duration have been established: spring regrowth shoots, budding, end flowering, fruiting. In studied roses, growing season begins first second decade March, occurs late May early June, fruits ripen August September. dependence timing on dynamics accumulated average daily air sum effective above 5 °C Mathematically, it proved that lower limit temperature required is +16 °C, when St° = 1007.75–1069.48 °С St эф > 530.75–594.75 accumulated. Early include foetida Herrm., R. pendulina pimpinellifolia caudata Baker corymbifera Borkh. shortest period Baker, jacutica Juz. kamtschatica Vent. Representatives those types mostly bloom once. Their flowers formed biennial more mature shoots. 13–23 days. rugosa Thunb. blooms again, its extended long from 40 48 All form longest Thunb., canina large ones marretii Lev. roxburghi Tratt.