According to a poem by Taras Shevchenko.

The story of a girl who misses her black-eyed boyfriend very much. He went somewhere and did not return. After two years, the girl is very tormented. Mothers are trying to marry her, because it's not the age to act. The girl goes to the fortune teller to find out her destiny and the fate of her black-eyed woman. The fortune teller gives her a potion, through which she learns that black-shaven is out of the world and turns into a tall poplar that grows up to the sky.