The analysis of influence of the temperature factor on timing of the main phenological phases in floribunda rose cultivars in the collection of the Stavropol Botanical Garden was carried out. The calculation of the sum of active temperatures above +5 °C showed that the beginning of vegetation is mainly observed in March, with a range of positive temperatures from 51 to 104 °C. The «budding» phase occurs in the first and second decades of May, when the sum of active temperatures was 562–788 °C. Flowering began in the first or second decade of June, when the sum of active temperatures reached 1012–1411 °C. The data obtained make it possible to predict the timing of a certain phenological phase in floribunda roses not only within the Stavropol Upland, but also in other regions with similar climatic conditions.

Bardakova S.A.