Abstract: Dahlia Cav. is a beautifully flowering perennial plant from the family Asteraceae Dum. It has storing root tubers that do not survive during the winter in the open ground of central Russia. This crop is characterized by a high variety of colors, shapes and sizes of inflorescences, different plant heights, long-term stable decorative effect from the beginning to the end of the growing season. The purpose of the study is to analyze the Dahlia × cultorum collection in the Botanical Garden-Institute of the Volga State University of Technology (Yoshkar-Ola, Mari El Republic). As of 2021, plants of 32 cultivars were grown in the exposition «Ornamental Herbaceous Plants», each cultivar is represented by 1-5 plants. It is established that the available cultivars belong to 6 classes according to the structure of inflorescences, the largest number of them belong to the class of Decorative and Semi-Cactus (12 and 8 names, respectively). According to the color of the inflorescences, the largest number of cultivars has bicolor inflorescences. The small-flowered cultivars dominated according to the inflorescences size. In general, most cultivars with large and medium-sized inflorescences have a decrease in their size. We can replenish the collection with varieties from the smallest represented classes, as well as the missing 6 classes. The results can be used in the practice of settlements landscaping of the Mari El Republic and nearby regions.

Abstract: 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.

Abstract: Daylily (Hemerocallis) is a perennial herbaceous plant widely used in landscape gardening. Daylilies are prized for their long term flowering mainly in late summer and low maintenance cultivation. According to flower spike height, the varieties are divided into runt, medium-growing and tall. The article contains the results of the study of 21 medium-growing daylily varieties’ terms of flowering in the botanic garden of the Volga region State University of Technology (Yoshkar-Ola, the Republic of Mari El). The research was conducted in 2015 - 2017. The calendar dates were converted into a continuous series. All varieties were classified as early, medium or late according to the terms of the beginning and the end of flowering and its duration. During three years of research, the earliest beginning of the phenological phase was registered in 2016, and the latest one  - in 2017. The early beginning and ending of flowering were typical for the varieties “Dr Regel” and “Royal Sovereign”. The late beginning of flowering was registered for the “Country Club” variety, and the late ending - for “Sandalwood”. Other varieties were classified as medium-term. The varieties “Royal Sovereign”, “Tejas”, and “Sugar Candy” are characterized by a short flowering period, while “Sandalwood” and “Derby Bound” - with a long one. It was established that the late-flowering varieties are characterized with a longer flowering period.