What does silver mean in Hilda Dooley's Pear Tree?

pear blossom

Among the pear trees written by Hilda doolittle, the pear described by the poet is crystal clear and makes people stare, but the pear tree is firm and high-spirited, supporting the blooming of pear flowers.

Hilda doolittle was born in a middle-class family in the United States. Her father was an astronomer and her personality was rigid and monotonous. Doolittle grew up in a mother's family that followed the Moravian tradition and was strictly controlled.