The Yogācārabhūmi-śāstra: Volume 34 (Part 26)

Original: How to observe the nature of impermanence in the changes of gardens? It means first seeing that in various gardens, the medicinal herbs, groves, flowers, fruits, branches, and leaves are all flourishing, green and red, very lovely and delightful. Then, at a later time, seeing them withered, with no flowers or fruits, branches and leaves fallen, burned by fire, or washed away by water. Having seen this, one thinks: Such conditioned phenomena are impermanent in nature. The rest is as previously stated.

Explanation: How to observe the nature of impermanence in the changes of gardens? First, seeing that in all gardens, the medicinal herbs, groves, flowers, fruits, branches, and leaves are all flourishing, with red flowers and green leaves very lovely. Then, at a later time, seeing that these plants have all withered, with no more flowers or fruits, leaves fallen, or burned by fire, or washed away by water. After observing these phenomena, one thinks: Such conditioned phenomena are truly impermanent in nature.