As a way of curriculum management in colleges and universities, a course group is also one of the effective ways to achieve the goal of training students. In architecture majors of engineering colleges and universities, plant courses are undoubtedly the core courses of landscape architecture. Still, they are not paid attention to in architecture and urban and rural planning. Based on the background of new engineering in the new era, rethinking the importance of plant courses. Then, taking Xiamen University Tan Kah Kee College as an example, it analyzes the present situation of plant courses, the connotation of plant courses, and the necessity of construction and puts forward the construction idea and teaching practice of plant courses group. The plant-related courses are connected horizontally, and the relevant knowledge points of plants are infiltrated into the vertically related courses, ultimately integrating plant knowledge among architecture majors. To achieve the purpose by decoding plant genes in the three majors of engineering architecture, exploring the method of curriculum integration and deepening the ‘two characteristics and one degree’ of the courses and achieve a hierarchical progression in teaching to improve the status that plant courses are not paid attention and promote the development and construction of human settlement environment science.