This paper investigates the imagery of flowers in Frost`s poetry. The flower is an important poetic character in his nature poetry. The symbolic imagery reflects men`s consciousness and intrinsic attributes. First, in "The Tuft of Flowers" and "Flower Gathering," flower imagery reminds the speaker of his relation with other people. Such imagery links two people firmly, turning the speaker`s mind to his social world. Second, flowers symbolize feminine sexuality in some of Frost`s poems such as "The Subverted Flower," "The Telephone," and "Wind and Window Flower"; sexual image of flowers evokes love toward a woman. Finally, flowers symbolize human mutability. Poems with such imagery include "A Boundless Moment," "Nothing Gold Can Stay," and "The Quest of the Purple-Fringed" among others; They reflect Frost`s personal tragedies and his philosophy on human nature. Flower imagery tends to change throughout Frost`s life, reflecting his change in consciousness and attitude towards life, expressing diverse aspects of human nature.