三七生长到冬至前后,多年来习惯是将茎叶剪除,喷药防病虫,清理七园后,就让其越冬。为了解老叶的作用,作者于1967年和1977年于靖西县安德田七场和靖西县田七场,选择生长一致的七园,在七园中取2～3分地进行留老叶越冬,使之翌年自然死亡的试验;又于1978年到云南考查三七时,发现云南铳卡三七场,其中有一七园,有一分多地去年没剪老叶,三七生长亦比剪老叶较好,观察结果如下: Panax notoginseng growth to before and after, the habit is to cut stems and leaves over the years, spraying pest control, clearing seven parks, let it wintering. In order to understand the role of the old leaves, the authors selected seven growing parks in seven fields of Andetian in Jingxi County and seven fields in Jingxi County in 1967 and 1977, and took two to three minutes in seven parks Old leaves overwintering, so that the natural death test the following year; and in 1978 to the Yunnan thirty-seven test, Yunnan thirty-seven card was found, of which there are seven parks, more than a year did not cut the old leaves, Better than cut the old leaves, the observations are as follows: