I believe the answer is:
“But under the fake windsounds of the open lanes,
in the abandoned lots below, new grasses sprout,
wild mustard remembers, old gardens
come back stronger than they were,
trees have been left standing in their yards.”
The excerpt above depict a story on how plants able to grow despite the difficult environment that they've been put through. This could be interpreted as an encouragement for people who are currently experiencing struggle in their life so we keep resilience and not lose our hope.