Daffodils are decorative spring-flowering bulbous plants characterized by unpretentiousness to growing conditions, abundant flowering and variety of flower shapes. The timing of their flowering depends on varietal characteristics, weather conditions and climatic conditions of the growing point. The purpose of this article was to study the seasonal development of 6 Daffodils varieties in the Mari El Republic. Observations were carried out in the Botanical Garden-Institute of the Volga State University of Technology (Yoshkar-Ola). The objects of the study were varieties: small-cupped– 'Carnmoon' and 'White Lady', large-cupped – 'Duke of Windsor' and 'Odense', double – 'Texas' and 'Yellow Cheerfulness'. Observations were carried out in 2014-2019 according to the methodology of the Main Botanical Garden of the Russian Academy of Sciences. It was found that the varieties starting vegetation later had a longer vegetation period. The dates of the beginning and mass flowering correlated with the dates of complete leaf death. The variety 'Yellow Cheerfulness' had the late passage of all studied phenophases, as well as the shortest duration of vegetation and growth. The variety 'Odense' was characterized by the early end of leaf growth, budding and flowering. The variety 'White Lady' had a long vegetation period and the leaf growth period, a late flowering end and a long flowering duration. The short duration of flowering is established in the variety 'Carnmoon'. The data obtained are of interest in the practice of daffodils growing in the settlements of the Mari El Republic.

Аннотация: Приведена характеристика метеоусловий теплого периода за 22-летний период с 2000 по 2021 годы для территории Ботанического сада-института Поволжского государственного технического университета (г. Йошкар-Ола). В ходе выполненной работы определены агроклиматические показатели: даты устойчивого перехода среднесуточных температур через 0 °C, 5 °C, 10 °C, 15 °C, сумма эффективных и активных температур, продолжительность вегетационного периода и периода активной вегетации, ГТК Селянинова. Указаны отличительные особенности некоторых лет. Для региона характерны слабозасушливые условия в период активной вегетации и выявлена тенденция повышения засушливости метеорологический условий.