What is the basic image of the poem "Love Should Grow Up Like a Wild Iris in the Fields"?

The wild iris is the basic image of the poem, and it
occurs six times as the image of the growth of love as an ideal. It is the constant
pattern of what love should be. At the end the speaker indicates that love is inherent
in individuals, who by nature are capable of opening “face up to the skies” in love. The
contrast is always in the poem, however, for the iris needs light to grow spontaneously,
just as human beings need the light to be right for love to flourish. The problem, as
the poem dramatizes it, is that light tends to be forgotten and submerged in songs that
are sung “over and over,” and in constantly taking seasonal clothing “to the cleaners
every fall.”