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The poem is chock full of plants, both the dead old ones that Winter has left behind, and the new ones that are emerging with spring.
Lines 9-13: This is a pretty long description of dead plants, especially for a poem this short. This tips us off to the importance of these plants as an image of cold and lifeless winter. More generally, they are symbols of the death that must come before rebirth and new possibility.
Line 16-18: These new plants are compared to human babies, another use of personification.