Evaporation creates a certain cooling effect. In addition, the reduced wind speed, encountering obstacles such as trees, shrubs and garden equipment. Above the roof of this reduction is 70%, and some gusts of wind speed reduces to 0.5 m / sec. Research biologists and botanists have shown that plants planted in the gardens on roofs, behave differently than plants of the same species grow on earth. In the spring of their active growth begins at 3 - 12 days earlier than on the ground, because the faster the thawing and warming of the soil. Just as earlier the flowering ornamental shrubs, although most species retain their duration of flowering. Fall foliage dress appears they also used for 4-10 days and sometimes more intense than on Earth, and the fruits ripen faster (maple near the river, Derain white, Spiraea Vangutta). Thus, in some plants in the gardens on the roofs of increasing the overall period of vegetation, and substantially - in ash, for example, from 139 to 180 days, viburnum - from 179 to 207 (according to the Central Botanical Garden in Minsk).
When selecting plants for a garden on an artificial basis must take into account all these circumstances, giving preference to low-maintenance and hardy plants, including the characteristic of mountainous regions. Predominantly a creeping or dwarf forms of trees and shrubs, herbaceous and especially ground cover plants and vines. Main criteria for selection of plants for gardens, roofs can name three: the environment, biocaenosis and decorative. Selection Plants should be determined primarily on the basis of agreement on the biology of growth conditions (this is the ecological criterion).
Thursday, 23 February 2012
