Grief in this poem begins as a habit. The speaker admits that thinking of the dead woman has "saddened" him, then confesses something more uncomfortable: he has been "nursing" a "shadow" that he was "growing to love almost." The verb makes memory sound like a patient tended in a sickroom, and the confession is that he has come to prefer the pale, manageable image to the woman herself. What breaks the habit is not a thought but a sight, sunlight lying on celandines "redoubled." The flower seems to catch the light and throw it back, so that light is laid on light, and out of that glare "she stood up like a flame." The simile works two ways at once, since it is both the flower's colour and the upright, living body of the woman, and the poem lets the two merge.
The longest stanza is the vision itself. It swells to eleven lines between a seven-line opening and a five-line close, so that it feels like a held breath. Its language is simple and almost breathless: "Beautiful, happy, simply as when she wore / Her brightest bloom among the winter hues / Of all the world." The phrase "short swift eternity" is a small paradox that captures the whole experience, a moment too brief to keep but felt as limitless. "Februarys before" turns the flowers into a shared calendar of earlier years. The poem tells us she "found the celandines… always before us all," and says her "nature and name / Were like those flowers" without ever giving the name. We get her through gestures instead: bending, treading "in and out," laughing, her hair "sweeping the mossy sod."
The sound of the poem carries its own meaning. The lines are loosely iambic pentameter, but the syntax stays conversational, so the poem reads like someone talking himself through an experience rather than reciting a lament. The rhymes are irregular and often delayed. "Flame," left without a partner in the first stanza, finds "name" and "came" only in the second, as though her return supplies the missing sound. In the final stanza the rhymes go back to the happy stanza: "more" echoes "wore" and "before," and "true" echoes "too" and "who." The effect is like a tune coming back slightly altered, with the same sounds now attached to "she was no more."
The turn is very plain: "But this was a dream." The structure that follows deliberately mirrors the opening. In the first stanza, "Until I saw the sun on the celandines" moves him from sadness into joy. In the last, "Until I stooped to pluck" moves him from joy into grief. Sight allowed the illusion, but touch and smell cannot sustain it. The "juice" of the plucked flower makes him sigh, and there is a bitter paradox in the line "the flowers were not true / Until I stooped." The flowers become real only when he handles them, and their reality is exactly what shows her absence. The same plant that gave her back takes her away.
The last line, "Gone like a never perfectly recalled air," is the most delicate. An "air" is a tune, and the comparison admits that even the vision he has just had will blur, like a melody you can hum but never quite complete. The line is drawn out by long vowels and by "never perfectly," and it fades instead of ending with a blow.
That quiet refusal of consolation is what gives the poem its force. It does not claim that nature heals or that memory restores the dead. It shows two things about mourning that are true and awkward together: that remembering can harden a person into a shadow, and that an unplanned moment can briefly return the living woman. But the return cannot last, and the loss is felt more sharply for having been interrupted. Thomas does this with one small scene, a patch of flowers and a hand reaching down, and no grand statement.