What does the flag of my disposition means ?

First, he calls the grass "the flag of my disposition," woven from his own hopes. Then he calls it the "handkerchief the Lord," intended to remind us of His power. Next he muses that the grass is also child (of the vegetation). ... It may have grown out of the remains of old people, women, or children who died too young.

Explanation:

BY observing how the place or location is