Comprehensive assessment of the spirea decorativeness (Spiraea L.) in the northern part of Kazakhstan

The purpose of the work is to carry out a comprehensive assessment of the decorative value of shrubs of the genus Spiraea L., growing in the collection stands of the arboretum and arboretum of Kazniilkha (northern part of Kazakhstan). Based on research performed in the arboretum and Arboretum ofthe Kazakh Scientific Research Institute of Forestry and Agroforestry (KazNIILHA) Fifteen species and varieties of plants of the genus Spiraea (Spiraea L.) have been found to be decorative and promising for use in landscaping settlements in Northern Kazakhstan. The age of the plants studied ranged from 10 to 30 years. Im the course of the study a point system of species and varieties was made according 10 characteristics: crow architecture: feowering duration; abundance of flowering; size of flowers; aroma of flowers; fruits, leaves; correctness of the appearance of fructs; autumn color of leaves; duration of defoliation, damagability; winter hardness. It has been established that all species and varieties of spirea are characterized by a high degree of decorativeness and stability. Despite of the tough forest growing conditions explained by the lack of precipitation, cold winters, late spring and early autumn frosts, the total score in the assessment varies from 32 to 39. The best indicators of decorativeness and stability are characterzed by varicties of Lapanese S., Japonica «Goldflame», », S. japonica «Magus carpet», S. japonica «Macrophylla». All the varieties lested scored 39 points. The front view of S. douglasii Hook has the lowest score, but even this view scores 32 points, which allows it to be classified as highly decorative. In general it can be stated that for north Kazakhstan a promising to use of all 15 species and varicties of spirea. Their use in landscaping will improve the decorativeness stability and recreational attractiveness of landscaping objects. However, given the importance of the problem, research on the viability of species and varieties of the genus Spiraea L. It should be continued.

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