Apparently Plath wrote the poem during her stay in the hospital, which can be a depressing place notwithstanding all the nurses and orderlies dressed in white. The appendectomy followed a miscarriage that Plath had suffered through, so given those realities in the poet's life -- especially for a woman to lose a child she had been carrying -- one can identify with the bleak nature of the poem. Confronted with the birth that turned out to be death, and then a painful appendectomy, the tulips are used as something of an abstraction and the redness of them gives her pain because it "corresponds" to the wound in her body from the surgery.

The opening stanza's first few lines seem rather peaceful and restful: "The tulips are too excitable, it is winter here / look how white everything is / How quiet, how snowed-in / I am learning peacefulness / lying...
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