海淀李子：紫玉垂枝，酸甜馥郁

Core Viewpoint - The article highlights the cultural significance and agricultural development of plums in Haidian, emphasizing their role in traditional Chinese culture and the advancements in cultivation techniques that enhance their quality and flavor [1][5][12]. Cultural Significance - Plums carry rich meanings in Chinese culture, symbolizing warmth and good wishes among people [5]. - The phrase "桃李满天下" reflects the relationship between teachers and students, with plums often gifted by educators to encourage students [6]. - Plums are seen as auspicious gifts, representing abundance and sweetness during social visits [7]. Historical Context - The cultivation of plums in Haidian dates back to the late Qing Dynasty and early Republic of China, where they were commonly planted in residential gardens [10]. - Over time, plum trees transitioned from a decorative element in farms to a significant agricultural product, benefiting from the region's favorable climate and soil conditions [12]. Agricultural Practices - The region employs scientific breeding and traditional grafting techniques to ensure the purity and disease resistance of plum varieties [13]. - Detailed management practices include organic fertilization, selective flower thinning, and careful irrigation to maintain the natural flavor of the plums [14]. - The optimal harvesting period for Haidian plums is from July to September, with specific criteria for determining the best time to pick [17]. Nutritional Benefits - Plums are not only delicious but also nutritious, rich in vitamin C, dietary fiber, and potassium, making them a healthy choice for the summer season [20].