Thoreau's Journal: 21-Aug-1852
The coloring and reddening of the leaves toward fall is interesting; as if the sun had so prevailed that even the leaves, better late than never, were turning to flowers,—so filled with mature juices, the whole plant turns at length to one flower, and all its leaves are petals around its fruit or dry seed. A second flowering to celebrate the maturity of the fruit. The first to celebrate the age of puberty, the marriageable age; the second, the maturity of the parent, the age of wisdom. the fullness of years.