Features of regeneration and growth of stem cuttings of decorative forms of the genus Juniperus L., promising for green construction in Belarus

Modern urbanization processes lead to the need to introduce new approaches to urban gardening in the practice of green building, which in turn requires the renewal and expansion of the range of ornamental plants that are used, characterized by their compactness and high resistance to environmental factors. An important role in this is given to plant introduction, designed at the first stage to assess the prospects of introductions and draw conclusions about the advisability of their further use in gardening. This article presents the results of primary introductory tests of 10 cultivars of 4 species of the genus Juniperus L., conducted in 2008–2018. It is established that the cultivars studied are characterized by a stable rhythm of shoot growth, which begins in late April and ends in the first half of September, which ensures the success of their wintering in the open ground. The evaluation of the regenerative capacity of stem cuttings made it possible to identify among the objects as hard-to-root forms (J. horizontalis ‘Emerald Spreader’ and ‘Monber’, J. sabina ‘Tam No Blight’ and J. chinensis ‘Gold Coast’) and medium- (J. horizontalis ‘Prince of Wales’, ‘Limeglow’ and ‘Glacier’, J. conferta ‘Shlager’) and easily rooted (J. horizontalis ‘Winter Blue’ and ‘Yukon Belle’). Satisfactory ability of stem cuttings to root formation allows to organize the production of planting material on the territory of the republic.

conifers, ornamental forms, cultivars, juniper, Juniperus, cutting, shoot growth

1. Karpun Yu. N. Basics of plant introduction. Hortus botanicus, 2004, vol. 2, pp. 17–32 (in Russian).

2. Kholopuk G. A., Torchik V. I. Decorative forms of juniper and the prospects for their introduction in Belarus. Promyshlennaya botanika: sostoyanie i perspektivy razvitiya: materialy VII Mezhdunarodnoi nauchnoi konferentsii (g. Donetsk, 17–19 maya 2017 g.) [Industrial botany: state and development prospects: proceedings of the VII International scientific conference (Donetsk, May 17–19, 2017)]. Rostov-na-Donu, 2017, pp. 456–459 (in Russian).

3. Torchik V. I., Kel’ko A. F., Kholopuk G. A. Risogenesis in ornamental garden forms of conifers and methods for its intensification. Minsk, Belaruskaya navuka Publ., 2017. 218 p. (in Russian).

4. Shkutko N. V., Shuravko M. V. Reproduction of cedar, juniper, cypress and yew with stem cuttings in Belarus. Recommendations. Minsk, s. n., 1988. 11 p. (in Russian).

5. Ponomarenko V. O. Stem cutting rooting of species and cultivars of Juniperus L. genus in dependence of life form. Introduktsiya roslin = Plant introduction, 2003, no. 3, pp. 99–105 (in Ukrainian).

6. Methodology of phenological observations in the botanical gardens of the USSR. Moscow, Main Botanical Garden of the USSR Academy of Sciences, 1975. 27 p. (in Russian).

7. Molchanov A. A., Smirnov V. V. Method of studying the growth of woody plants. Moscow, Nauka Publ., 1967. 100 p. (in Russian).

8. Torchik V. I., Antonyuk Y. D. Ornamental garden forms of coniferous plants. Minsk, Edit VV Publ., 2007. 152 p. (in Russian).