Which preposition to use with aflower

with Occurrences 1%

Six petals with a dewdrop in their heart, Six pure brave years, an ivory cup of tears; Six pearly-pillared stamens golden-crowned Growing from out the dewdrop, and a seventh Soaring alone trilobed and mystic green; Six pearl-bright years aflower with gold of joy, Sprung from the heart of those brave tear-fed years: But what that seventh single stamen is My little wit must leave for thee to tell.

Which preposition to use with  aflower