The vast majority of alien plant species are cultivated in botanical gardens. Many of them have been assigned the status of invasive activity. One of the transformer species in the list of invasive plants of the Botanical Garden of Vyatka State University is Petasites hybridus (L.) Gaertn., B. Mey. & Scherb. Active dispersal of the species is caused by the peculiarities of its structural organization. It was established that P. hybridus is a summer-green vegetative-mobile short-rhizomes herbaceous polycarpic herbaceous polycarpic, geophyte. Due to the development of geophilic shoots, P. hybridus actively colonizes neighboring territories, and the system of shortened sympodially growing rhizomes contributes to the consolidation and retention of the developed area. We recommend to control the process of dispersal by removing a number of clones from the territory in the fall or by installing artificial fences to a depth of up to 30 cm.

One of the most important tasks in the field of biodiversity conservation is the globally recognized control of invasive species. These include alien species that occur outside their historical natural range and, when introduced, cause ecological, social or economic damage. Therefore, the problem of introducing alien species into the natural habitat of native vegetation is relevant. In the territory of southeastern and southern Kazakhstan locations of two particularly active invasive species were found: Heracleum sosnowskyi Manden. and Echinocystis lobata (Michx.) Torr. & A. Gray, capable of forming extensive thickets. Early detection and traceability of invasive species is critical to prevent their spread and reduce their damage.

An analysis of the results of floristic studies of natural and semi-natural habitats conducted from 2012 to 2023 in the cities of the southern half of Udmurtia – Votkinsk, Mozhga and Kambarka is given. The combined partial flora of natural and semi-natural habitats in the studied cities includes 819 plant species from 104 families, of which 114 species (14 %) are alien. Most of the identified species belong to the group of annual herbaceous plants, that is characteristic of alien fractions of floras. There are only 20 species which belong to tree and shrub life forms, all of them being ergasiophyphytes. When alien plants of natural habitats are distributed according to the degree of naturalization, a high proportion of epecophytes and agriophytes is observed.

The mining and technical recultivation of technozems contributes to the restoration of the numerical composition of the community of soil microorganisms that take part in the processes of nitrogen compounds transformation. This is evidenced by the restoration of the number of organotrophic bacteria of the nitrogen cycle to 0.3 million CFU/g of soil and a 2–3 times increase in the number of streptomycetes in the surface layers. The increasing indicators of microbiological transformation and mineralization of organic compounds in technozems confirm the restoration of their biogenicity during recultivation, which contributes to the intensification of mineralization processes and the absorption of nitrogen compounds by plants in the soil.

The collection-show garden «Shadow Garden» of the N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences is one of the oldest collections of representatives of the herbaceous tier of such type of vegetation as broad-leaved forests of the temperate zone of the Northern Hemisphere. The following methods of introduction have been the basis of selection since 1973 and up to the present time: ecologicalgeographical, phytocenotic, as well as differential botanical-geographical. According to the inventory of 2024, the collection-show garden «Shadow Garden» has 351 species and 47 cultivars of shade-tolerant and shade perennial herbaceous plants. Most of the taxa presented at the exposition can be classified as promising (55 %), 38 % are very promising species and cultivars for cultivation in the middle zone, we recommend them for mass urban landscaping.

Every year, new zoned varieties appear that meet the natural and climatic conditions of a particular region. Due to the fact that most varieties of irises are bred in countries with a warm climate, there is a need to create domestic varieties that are not inferior in decorative qualities to the latest varieties of foreign breeding. As part of the study, a comparative study of Iris ×hybrida hort varieties was conducted according to such traits as resistance to diseases and pests, abundance of flowering, pollen fertility, plant height, number of flowers on the peduncle, length and width of the flower. The Gold of Canada is used as a standard variety. According to the results of our study, the varieties with the highest breeding index reflecting the presence of all the studied characteristics were identified.

The article presents data on eight species of Auchenorrhyncha (Aphrophoridae, Cicadellidae, Issidae and Membracidae) registered in the green spaces of Donbass in 2020, 2021, 2023 and 2024. All recorded species are newly reported for the region’s fauna, with Populicerus nitidissimus (Herrich-Schäffer, 1835) being documented for the first time in the steppe zone of Europe. Including data from literature, a total of 67 Auchenorrhyncha species have now been registered in the study area, seven of which are considered alien invasive species. Local outbreaks of mass reproduction in the region may be attributed to Oncopsis flavicollis (Linnaeus, 1761), Opsius stactogalus Fieber, 1866, and Gargara (s. str.) genistae (Fabricius, 1775). Additionally, Oncopsis alni (Schrank, 1801) may be as a vector for phytoplasmas that cause diseases in nut, fruit, and ornamental woody plants.

The article analyzes the collections of leaf beetles and weevils carried out using the method of pitfall traps lines in the Botanical Garden of Perm State National Research University (Perm) during four growing seasons (from April to October–November 2021–2023 and from April to August 2024). A total of 4425 specimens were collected, belonging to 92 species from three families (Chrysomelidae – 32; Brentidae – 14; Curculionidae – 46). Three invasive species (Exomias pellucidus Boheman, 1834), Otiorhynchus smreczynskii Cmoluch, 1968 and O. sulcatus (Fabricius, 1775)) native to Central and South-Eastern Europe have been registered. The fauna of leaf beetles and weevils of the Botanical Garden has a more southern appearance than the zonal fauna of the northern subtaiga, due to the significant proportion of species with south-boreal-subboreal (16; 17.5 %) and subboreal (6; 6.5 %) types of ranges. Among the phytophagous beetles, eurybionts and representatives of the pioneer complex are sharply predominant (a total of 86 %), while the proportion and abundance of forest and forest edge species, characteristic of the natural ecosystems of the region, are low.

A study of the syntaxonomic diversity and distribution in the Donetsk upland and Northern Azov region of phytocenoses of meadow and shrub steppes allowed us to determine the composition of plant communities with dominance and subdomination of feather grass: 50 associations from 14 formations of the meadow steppe (Steppa pratensis), 42 associations from 14 formations of the shrub steppe (Steppa fruticosa). Of these, 35 and 26 plant communities, respectively, can be recommended for special protection. Respectively, 15 and 16 plant communities are regionally rare. As many as 29 rarity communities of meadow steppe and 37 of shrub steppe have been recorded in specially protected natural areas. The widest environmental and phytocenotic range is associated with Stipa capillata L., S. grafiana Steven, S. lessingiana Trin. & Rupr., S. tirsa Steven, which enables these species to participate in forming of various classes of steppe vegetation formations. The most associatively represented formations are Stipeta capillatae, Stipeta grafianae, Stipeta tirsae.

It is shown that the fraction of forest and forest-edge species of the specific flora of the Donetsk Botanical Garden is 126 species, including 15 endemics, 2 relic and 15 sozophyte species. According to their origin these species are divided in four groups: 1) aboriginal for Donbass and specific flora (48 species); 2) aboriginal for the specific flora and «escaping from cultivation» (46 species); 3) introduced species, «escaping from cultivation», growing within their natural range (27 species); 4) introduced species, «escaping from cultivation», growing beyond their natural range (5 species). Spontaneous forest flora of Donetsk Botanical Garden is impoverished compared to similar floras of Krynka floristic subdistricts according to a number of autochthonous species, meanwhile it is enriched by «escaping from cultivation» species.