What do the “crow” and “hemlock” represent — joy or sorrow? What does the dust of snow that the crow shakes off a hemlock tree stand for?

The crow and the hemlock tree both represent grief. The dust of snow that is shaken off the hemlock tree by the crow stands for happiness that Frost experiences. That is why, he has used an unconventional tree and bird in order to compare them with joy in the form of snow.

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