Hemerocallis originated in China and is the mother flower of China. With the development of the Hemerocallis industry in China, some nurseries in China have introduced new Hemerocallis varieties developed by domestic or abroad breeders for expanded production. However, numerous difficulties include the high cost of new Hemerocallis varieties, low awareness of purchasers and the plant landscape designers, failure to understand the designer’s design techniques and other issues. Therefore, difficulties in the promotion were encountered. A questionnaire survey on the plant landscape designers of Hemerocallis was performed, and it focused on the Hemerocallis application of the following six sub-systems: types of projects, application scenarios, commonly used varieties and specifications, designers’ understanding, the shortage in the market circulation and the potential demand for new varieties. It was found from the survey that the application of Hemerocallis has various types of projects, mainly urban park greening, residential area greening, and municipal road greening; Planting under the forest and flower border are the main application scenarios of Hemerocallis; The commonly used varieties are Hemerocallis var. ‘aurantiaca’ and ‘Stella deoro’. Hemerocallis is used in various specifications, and bare-root and container seedlings are required. The designers have an insufficient understanding of the excellent characteristics of Hemerocallis, and “Forget to worry” and “filial piety” are the designers’ main understanding of Hemerocallis culture; The main shortcomings of Hemerocallis in market circulation is that it cannot be a scene immediately, the flower color and plant type are monotonous; The potential demand of the new variety of Hemerocallis is mainly evergreen in winter, richer flower color. The relevant research results are expected to promote the combination of production and design application of Hemerocallis, enhance its landscape performance, explore the potential market demand for Hemerocallis, and promote the development of the Hemerocallis industry in China.