The target of our experiences consists in establishing the level critical temperatures and the mode preservation during cold period of the year for the species and cultivars of deciduous ornamental woody plants in containerized culture. Because of at the plants being fortified in container conditions, frequently occurs the phenomenon of spiraling root system, standing at the periphery of the substrate, endangered by frost and, proceeding from the need of protection during the winter, we suggest the following objectives: * the comparative comportment of the species and cultivars during the cold season, depending on the way of storage; * the species and cultivars hardiness at low temperatures, depending on the ecological requirements of plants. For containerized culture of ornamental species and cultivars following conservation cold season were established: V1 – protected plants displayed in greenhouse; V2 – protected plants and exposed outdoor but covered with protective acrylic cloth; V3 – plants unprotected and exposed outdoors throughout the cold period. Final results shown that the species and cultivars of deciduous plants remarked the highest coefficient – 100% resistance at low temperatures where all three variants of wintering (V1, V2, V3) at the end of the cold period the plants were started in vegetation and there were no damages caused by the frost