Summer‐flowering trees and shrubs in landscaping for the south‐eastern coast of the Crimea

Abstract

Aim. To study the species composition, form diversity, bioecological features of summer‐ flowering trees and shrubs in green spaces of the south‐eastern coast of the Crimea and suggest ways to expand the range. Materials and Methods. The green spaces of Feodosia, Sudak and the localities of Semidvorye, Solnechnogorskoye, Malorechenskoye, Rybachye, Morskoye, Novy Svet, Solnechnaya Dolina, Shchebetovka, Kurortnoye, Koktebel and Primorskiy were investigated. Bioecological and phenological studies of ornamental trees and shrubs were undertaken according to generally accepted methods. Results. The species composition and shape diversity of summer‐flowering trees and shrubs in green plantings of Crimea’s south‐eastern coast were identified. It was found that summer‐ flowering plants make up almost half of the species composition (48.6%) used in landscaping. However, only 23 species are widespread throughout the region, such as Ailanthus altissima (Mill.) Swingle, Albizia julibrissin Durazz., Buddleja davidii Franch., Campsis radicans (L.) Seem., Elaeagnus angustifolia L. etc. The greatest number of species and forms of arboreal plants bloom in early summer, their number decreasing significantly from the second decade of June. Conclusion. An assortment is proposed for increasing the number of trees and shrubs which flower during the summer, taking into account both their decorative visual appeal and their environmental requirements, especially drought and frost resistance. Of great interest are species that bloom from June onwards, especially those which are highly decorative and have a long flowering period, such as Albizia julibrissin, Buddleja davidi and forms, Hydrangea arborescens L., Campsis radicans, Kerria japonica f. plena C.K. Schneid, Robinia viscosа Vent., Vitex angus‐castus L.