Application of microbial preparations in the technologies of decorative plant cultivation promotes uptake of biological nitrogen and phosphorus, increases population of beneficial soil microflora, causing favorable effect on growth of green plantations. The studies have shown that introduction of nitrogen fixing and phosphate mobilizing bacteria into the rhizosphere of floral, deciduous and coniferous decorative shrubby arboreal species had risen the biogenic potential of rhizospheric soil, had stimulated the growth and development of ornamentals by increasing plants height and forming big healthy root system, as well as had facilitated early budding and blossoming in floral species.