Abstract: Clematis is one of the highly ornamental plants used in landscaping, but they are often susceptible to diseases as a result of abiotic and biotic factors action. The article presents an overview of diseases and pests of clematis. Among them, wilt is especially dangerous, which leads to a sharp withering of plants. Also, clematis can be affected by rust, powdery mildew, gray rot, various types of spotting, etc., as well as pests nematode, worm, aphids, spider mite, slugs, etc. Information on pest control and diseases of clematis is presented. Possible signs of weakening of non-infectious plants are indicated. The diseases identified during the visual examination of clematis in the Botanical Garden-Institute of VSUT (Yoshkar-Ola) are given. The plants grow on the lianas site of the Fruticetum exposition. Wilting was observed in plants older than 20 years: symptoms were detected in 1/3 of plants. Most of the collection plants showed signs of spotting. In some varietal clematis, small-leaved was observed. Damage by leaf-eating insects and mice, as well as mechanical damage from hail and rain were revealed. Agrotechnical measures carried out for the prevention of diseases are presented. The obtained data can be used in the practice of growing clematis at the landscaping facilities of settlements in the region.

Abstract: There is the site of lianas as a part of the exposition «Fruticetum» in the Botanical Garden-Institute of Volga State University of Technology. It is an area of 0.15 hectares, with 5 rows of metal supports 1.5–3.0 high. Woody plants of 98 names from 14 genera of 10 families grow here: Actinidiaceae, Aristolochiaceae, Bignoniaceae, Caprifoliaceae, Celastraceae, Hydrangeaceae, Menispermaceae, Ranunculaceae, Schisandraceae, Vitaceae. The largest number of taxa in the collection includes the following genera: Clematis – 54 taxa, Vitis – 10, Lonicera – 7. The most widely represented family is Ranunculaceae (56 taxa). The Vitaceae family contains the largest number of genera (3). Cultivars and hybrids have the main share in the collection (62.2%). The cultivars of clematis are the most numerous (42 names). They have a high decorative value and are an undoubted decoration of the site. The low ornamental shrubs and perennial herbaceous plants are planted in the exposition to increase the decorative effect. The article provides information about winter hardiness, growth and development of lianas, as well as the features of agrotechnical measures. The directions of development are presented. These data are of interest to employees of botanical gardens, students of plant-growing directions and amateur gardeners. The materials are accompanied by photographs.

Abstract: The article presents the analysis of the dynamics of the Hydrangeaceae family collection in the "Fruticetum" exposition. The study was conducted on the basis of introduction cards and introduction journals of the BSI as of 2020. Currently, Hydrangeaceae includes 78 names: 6 Deutzia taxa (8 samples), 24 Hydrangea taxa (30 samples), 48 Philadelphus taxa (56 samples). Among all samples, 72.4% came in the form of seedlings, 22.3% – green cuttings, 5.3% – seeds. The main source of hydrangeas is the Main Botanical Garden of the Russian Academy of Sciences, from where 54% of all samples were obtained. Also, samples were received from other botanical gardens, nurseries and from private individuals. The oldest surviving specimen (Deutzia scabra) was received in 1974. The most intensive replenishment of the collection was observed in 1981–1983, later it slowed down. Since the mid-2000s, the attraction of new species and varieties has accelerated again. Graphs showing the dynamics of the number of taxa and samples of the studied genera are given. In total, 389 plants of the studied family grow in the exposition, of which the largest number are Mock orange. Most taxa are represented by 1 to 13 plant specimens. Further increase in the collection is constrained by the shortage of free territory for planting. This article is of interest to employees of botanical gardens, students of plant-growing directions and amateur gardeners.

Abstract: Representatives of the genus Pentaphylloides are low ornamental shrubs that are valued for long abundant flowering, compact size and unpretentiousness to growing conditions. P. fruticosa is a valuable plant that has not only decorative value, but also food, medicinal, soil protection. For medicinal purposes, young flowering shoots are used, harvested during budding and flowering. The article presents the results of phenological observations in 2018-2020. The objects of the study were plants of 8 kinds of Pentaphylloides in the collection of the Botanical Garden-Institute of Volga State University of Technology (Yoshkar-Ola, Mari El Republic). The studied plants undergo most phases of seasonal development, with the exception of the mass end of shoot growth, complete lignification of shoots, mass ripening of fruits, mass leaf fall. Species and cultivars vegetated from the end of April – the beginning of May to the end of October in a short time. The vegetation period was 177-182 days. There was no significant difference in the timing of the passage of phenophases between the taxa. Plants of Р. × friedrichsenii and P. mandschurica passed most of the phenophases earlier than the average dates for the genus, and 'Goldfinger' and 'Klondike' – later. The earliest and longest flowering was characterized by P. friedrichsenii (65 d.), the latest and shortest – P. fruticosa (28 d.). All plants of P. fruticosa cultivars bloomed for a longer period than the species. After mass flowering, single flowers were observed in representatives of Pentaphyloides until mid-October.

Abstract: Species of the genus Philadelphus L. (mock orange) are among the most popular ornamental shrubs. They are valued for low maintenance, abundant flowering, exceptional aroma of flowers and a prolonged flowering period during high summer, by when many shrubs already fade. The results of phenological observations of 2018-2020 are presented in the article. The objects of the research were the plants of 8 cultivars of mock orange selected by N. K. Vekhov in the Botanical Garden-Institute of VSUT (Yoshkar-Ola, Mari El Republic). The vegetation of plants lasts from the beginning of May to the end of September and has a duration of 177-189 days.  The 'Airborne force' (Vozdushny desant) cultivar was characterized by the longest growing season.  The full leafing occurred in the first decade of June, the growth of scions ended in the first half of August. Flowering began in the third decade of June and lasted on average for 13-28 days. The cultivar 'Vosdushny Desant' has the earliest beginning of flowering, 'Arktika' has the latest one. The plants of 'Elbrus' were characterized by the longest flowering, 'Yunnat' – by the shortest one. There was no connection between the duration of flowering and the structure of flowers.

Abstract: Deutzia is an ornamental flowering shrub valued for its abundant long-term flowering and the elegance of flowers shape. The research objects are the plants of 3 species and 1 variety of Deutzia in the Botanic Garden-Institute of VSUT (Yoshkar-Ola, Mari El Republic). Plants aged from 38 to 45 years grow in the exhibition “Fruticetum”. The study was conducted in 2015-2019. The height and diameter of plants crowns, their winter hardiness for the period from 1981 to 2019, the morphometric indicators of leaves and inflorescences, the possibility of vegetative propagation by herbaceous cuttings, and the size of annual plants were studied. According to the study results, the most hardy is Deutzia of Amur, which forms the highest shrubs. The long-leaved Deutzia has the longest leaf blades, Deutzia scabra ‘Plena’ has the smallest leaves. The long-leaved Deutzia has the largest inflorescences, Deutzia of Amur and Deutzia scabra ‘Plena’ have the smallest ones. Deutzia magnifica and Deutzia scabra ‘Plena’ have ornamentality advantage over other species due to the double flowers. For the maximum display of ornamental qualities, the plants need a successful overwintering. The greatest ability to reproduce by herbaceous cuttings is noted for Deutzia scabra ‘Plena’. The results of this study are important for the Deutzia application in the garden and park construction. In the landscaping of the republic settlements Deutzia is recommended for the target assortment.