In "Dust of Snow," the crow and the hemlock tree are unconventional, dark symbols that Frost deliberately chose over cheerful alternatives.
The crow is typically associated with ill omen and gloom, unlike birds such as the sparrow or dove that usually appear in poems. It represents darkness and sorrow.
The hemlock tree is a poisonous plant, traditionally linked to death and misfortune, rather than a beautiful maple, oak, or pine.
By using these negative symbols together, Frost shows that even gloomy, inauspicious elements of nature can bring an unexpected positive change. The crow shaking snow from the hemlock transformed the poet's regretful, depressed mood into a lighter one — suggesting that joy can arise from the most unlikely sources.
Source: Dust of Snow, First Flight (Class 10)
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