Secondly, you need to worry about creating sustainable combinations of plants – viable ecological communities. Use plants are unusual, not typical for the region, where a garden with different origins, perhaps, but only on condition that they are introduced, ie, grown adapted to an alien environment and climate. But to compose these exotic newcomers in a group with the usual, "native" plants – more than controversial: even if they come to each other by their decorative features, they are unlikely to be able to make good biocaenosis and coexist with each other. Therefore, they should be merged into separate tracks. And finally, what is often considered a major landscape designers – an aesthetic criterion. (Source: Vadim Belyaev, New York City). It is based on the merits of each type of ornamental plants, its external forms and includes plant height, the shape of his crown, the nature of branching and leafy, color bark, leaves, flowers and fruits their scent relationship with each other, seasonal and age variation of each species. In essence, this criterion is applicable to plant compositions of any object of landscape architecture, but in comparison with the decorative use of plants in interior design cottage in a small space garden on the roof closed, bounded by high railings, it is particularly important. The plants in this garden are seen in detail, at close distance. Appearance (habitus) of the plant, defined by its morphological features, characteristic for each species, but each instance of this may be peculiar to his personality, and this also needs to considered.