If you're interested in writing a poem with that line, here are some ideas to get you started:
* Focus on the change of seasons: The line itself evokes the transition from summer to autumn. You could explore the beauty of the changing colors, the feeling of the air getting crisper, and the anticipation of the coming winter.
* Use the sumac as a symbol: The sumac could represent something like the fleeting nature of time, the cycle of life and death, or the beauty that can be found in impermanence.
* Create a narrative: The line could be part of a larger story about a person's journey, a love affair, or a historical event.
Let your imagination run wild and see what kind of poem you can create with this beautiful line!