Current application status of urban greenery Rosa chinensis varieties in Shanghai, China

In this paper, we conducted a study of the growth of 18 varieties of roses (Rosa chinensis Jacq.) in 15 representative parks and roads in late summer and early autumn, when the roses are in full bloom. The results showed that it is better suited for Shanghai to plant heat and humidity tolerant varieties such as "Wonderland" and "Angela", and that they are already planted on large scale both in quantity and in area. However, the promotion of cherished varieties needs to be improved. Secondly, soil nutrients and diseases have a significant impact on the growth of roses, and most of the habitats in the green belts are unsatisfied, with low soil fertility and high rates of disease spread between plants in this season, such as black spot. We hope that the present study will provide a data background for further strengthening of key technical studies such as screening, breeding and configuration studies of suitable colourful and precious rose varieties in the future.