THE STATE OF TROPICAL AND SUBTROPICAL SPECIES COLLECTION IN THE WINTER GARDEN OF THE RUSSIAN RESEARCH INSTITUTE OF FLORICULTURE AND SUBTROPICAL CROPS

The conditions during a cold period of 2016–2017 allowed us to fully observe the cold resistance of heat-loving plants. Based on the analysis of tropical and subtropical plants collection cultivated in the winter garden (Russian Research Institute of Floriculture and Subtropical Crops), there were recorded some species non-resistant to low positive temperatures. In general, under the influence of unfavorable environmental conditions, the plants exhibited the first signs of damage: leaves twisting, green leaves, brown and black spots appearing on the surface of leaves, blackening of the top of the plate, complete loss of turgor and, less often, darkening of the shoots tip. In each family there are different types of resistance. After the restoration of optimal conditions the majority of damaged plants restored and grew properly.