what are the poetic devices used in this poem?

Poetic devices used in the poem are:

• Simili: 

(a) 'I looked again at her,wan, pale as a late winter's moon' ( Mother is compared to winter's moon.)

(b)   mother's face 'ashen like that of a corpse'

• Contrast:  Old age of mother contrasted with young trees and merry children who are full with vigor of life
• Imagery:  

(a) mother's face 'ashen like that of a corpse' mother's face 'ashen like that of a corpse'    

(b) 'merry children spilling out of their homes'