Yogācārabhūmi-śāstra, Volume 34 (26)

Original text: 云何观察园事变异无常之性。谓先观见。诸园苑中药草丛林。华果枝叶。悉皆茂盛。青翠丹晖。甚可爱乐。复于后时。见彼枯槁。无诸华果。柯叶零落。火所焚烧。水所漂荡。见是事已。便作是念。如是诸行。其性无常。余如前说。

Explanation: How does one observe the impermanent and mutable nature of garden phenomena? Previously, one saw that in all the gardens and parks, the medicinal herbs, groves, flowers, fruits, branches, and leaves were all lush and flourishing, with red blossoms and green leaves, exceedingly lovely and delightful. But later, one sees that these plants have all withered, bearing no more flowers or fruits; the leaves have all fallen, or they have been burned by fire, or swept down by water. After observing these phenomena, one reflects in mind: such conditioned formations are truly impermanent in nature.