《资治通鉴·唐纪·唐纪五十五》
大凡树木的本性，树根喜欢舒展，喜欢让人培上陈泥。将树木种植好后，不需挪动它，不需为它担心，离开它后，便不用再去看管它。
凡木之性，其根欲舒，其土欲故，既植之，勿动勿虑，去不复顾。
In general, the nature of trees is that their roots like to stretch out and be covered with old mud. After planting a tree, there is no need to move it, worry about it, or look after it after leaving.