Abstract
Scutellaria baicalensis is a valuable medicinal plant and a protected species of the East Asian flora. Therefore, work on its introduction is underway in many regions of Russian Federation. Studying of the influence of meteorological factors on the phenology of the S. baicalensis in regions of Russian Federation with contrasting climatic conditions is important in grounds of climate change.
 Materials and methods. The object of the study is the population of the S. baicalensis biocollections of All-Russian Scientific Research Institute of Medicinal and Aromatic Plants and Nikitsky Botanical Garden. Meteorological indicators: sum of active temperatures, sum of precipitation. Statistical analysis: Tau-b-Kendall correlation coefficient.
 Results. The duration of the growing season in each region has little variability, independently of the weather conditions of the year. The interval between the onset of phenological phases in the Crimea was characterized by weaker variability than in the Non-Chernozem zone. A significantly smaller amount of active temperatures was required for the onset of phenological phases In the Non-Chernozem zone compared to the southern coast of Crimea. The difference in the average sum of active temperatures across the regions reached 1694.6°C by the end of the growing season. The amount of precipitation had sharp fluctuations in both regions and in all years of research.
 Conclusion. Secondary flowering, wide amplitudes of the duration of phenological phases and the growing season as a whole, the sum of active temperatures and precipitation indicate the ecological plasticity of the S. baicalensis and the availability of conditions for its cultivation in both regions.
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