Identifying the Tone in a Poetic Excerpt

Read the following excerpt from a poem:

"In the melancholic garden, beneath the weeping willow,
Time drips like dew on aged petals, a heavy toll.
Unspoken desires linger like shadows in the dusk,
As the fragrance of lost dreams wafts away, hushed.

This excerpt explores themes of nostalgia and loss. Consider the tone conveyed through the word choices and imagery. What is the predominant tone of the poem excerpt?