The results of the introduction of some representatives of the genus Sorbus l. in the Southern Urals

The work is devoted to the evaluation of the introduction of representatives of the genus Sorbus of the collection of the South Ural Botanical Garden-Institute in the South Urals. The material for the study was the results of own phenological observations of 42 taxa of the genus rowan, determination of winter hardiness and resistance using generally accepted methods, period 2012–2024. Based on the results of the evaluation, all species and varieties of mountain ash in the collection are divided into 3 groups: I – the most promising (31 taxa), II – promising (8 taxa) and III – less promising (3 taxa). Representatives of the first group have resistance to local climatic conditions and high winter hardiness: S. amurensis, S. americana, S. × arnoldiana, S. aucuparia etc. The vital condition is good. The second group includes species whose winter hardiness may be reduced to an I–II score in some years: S. × hybrida, S. intermedia, S. arranensis, S. mougeotii, S. graeca. This group also includes fruit varieties of mountain ash that have not reached the age of fruiting: S. aucuparia ‘Angri’, S. aucuparia ‘Doch Kubovoj’ and S. aucuparia ‘Wefed’. The vital condition is satisfactory. The third group, less promising, includes three species: S. alnifolia, S. velutina and S. aria, which do not retain their growth form, do not bear fruit (except S. aria), in some years winter hardiness may decrease to II–III points. The vital condition is weakened. Taxa included in the introduction relatively recently (2005–2014) are recommended to be considered promising as fruit crops in the conditions of the Southern Urals, except for rowan trees of earlier planting (1958– 1987): S. caucasica,S. × latifolia, S. teodorii, Sorbocotoneaster pozdnijkovii, S. scopulina, S. sambucifolia, S. pohuashanensis and S. aucuparia var. moravica, S. aucuparia ‘Alaya krupnaya’, × Crataegosorbus miczurinii ‘Granatnaya’, S. aucuparia ‘Nevezhinskaya’ as fruit.