Lonicera tatarica in the Yakutsk Botanical Garden

The aim of research is to study the rhythms of development of L. tatarica depending on the weather conditions of the climate in Central Yakutia. The observations were carried out in the Yakutsk Botanical Garden of the Institute for Biological Problems of the Cryolithozone (YBG IBPC), which is located 7 km west of the city of Yakutsk and is, in terms of climate and vegetation, a typical site of Central Yakutia in the period 2005-2020. On the site of the dendrocollection, two sites were selected: an open elevated site on a lakeside crest and in a lowland under a forest canopy, on which bushes of Tatar honeysuckle were planted (15 pcs.). The age of the bushes is 10-12 years. A number of plants had pink flowers and red fruits, others had white flowers and orange fruits. Phenological observations were carried out according to the method of I.N. Beideman (1974). The phases of the beginning of the growing season, flowering, and fruit formation were noted. Meteorological observations are given according to the URL: https://pogodaiklimat.ru and our own observations. Winter hardiness was assessed on a scale from I to VII points, developed in the Main Botanical Garden of the USSR Academy of Sciences (Lapin, 1975). Information on the introduction of ornamental honeysuckle in the Yakutsk Botanical Garden is presented. In total, more than 30 species and 11 varieties of honeysuckle were tested. Most of the ornamental honeysuckle died in the early years. Currently, the collection includes 5 types of decorative honeysuckle. The most promising of these is Tatar honeysuckle, Lonicera tatarica var. alba and var. rosea. In the period 2015-2020 the following phases: the beginning of the growing season, flowering, fruit formation were observed. The phenophases and weather conditions analysis of Central Yakutia showed that the developmental rhythm of Tatar honeysuckle is consistent with the rhythm of weather conditions. For the beginning of the growing season, 19.8 ºC is required, for flowering - the sum of effective temperatures from 355 to 603 ºC is required. Winter hardiness is 1-2 points, although in some years freezing of skeletal branches is possible.