Roof Garden (7 photos) | Nature
These gardens have become very fashionable in recent years, and this is due to the advent of our penthouses. That's just one problem - these gardens came from the edges, where there are no harsh winter. The main reason that hinders the development of roof gardens in our area - this is a problem overwintering.
The plant is planted in a container or bulk soil to the roof of the house, in our conditions is practically doomed to perish in the winter because of the freezing of the root system. There are only a few positive examples when a particular plant roof overwinter successfully in such conditions without special insulation rootball. No, no yes and there are eyewitness accounts that they had no problems winters in the open balcony of such a copy of the (often referred to Parthenocissus quinquefolia). But it is not systematic observation, and we can not significantly rely on the data unverified facts. Most likely, these positive results wintering plants in rooftop gardens really are, especially when you consider that the last few winters have been very mild. Guaranteed solution to the problem of plants overwintering in containers on the roofs and balconies could be moderate and precisely metered heating rootball to keep the temperature in the range -4 ... 0 ° C. In such circumstances, the existence in the roof garden of herbaceous perennials becomes absolutely real, and woody plants - valid.
Another problem of survival on the roof of trees and shrubs - a succession of thaws and frosts in late winter - early spring. In nature, plants are thus not begin to vegetation and are not subject to frost damage to return, since the cooled natural ground works as a refrigerator, preventing root system activity and hence preventing kidney awakening. Another thing on the roof of the container. The container is small enough and the soil it is heated too rapidly during the thaw. It is obvious that in the summer of gardens on the roofs of houses the most pressing is the problem of overheating of plants, and especially - the overheating of the root system. But in the summer, when properly organized irrigation system combining drip irrigation and sprinkler irrigation or intermittent artificial fog, plants overheating avoidable and is not a serious limiting factor. But what to do in the winter? How to create a roof conditions close to natural, so that the soil in the containers was as inertial, as the soil on the surface of the earth? Probably, the active system device may thermoregulation root layer, but the cost of such automatic system is sufficiently high.
As you can see, this problem has not yet finished the technical solutions, and gardens with a device similar regulatory loops until it is advisable to only as an experiment with a wide range of professionals - builders, designers, and of course the landscape agronomists ...
According to the authors, in our climatic zone on the roof garden is best to arrange as a collapsible or sliding structure made of polycarbonate, which operates in the winter as a winter garden (heated greenhouse), and in the summer - just like an open-air garden. And do not forget about the wonderful opportunity to grow a variety of annuals, including curly.