Keats begins a thank-you poem by leaving the friend out of it. For ten lines he wanders through fields, meets a skylark, imagines knights and fairies, and falls for a wild musk-rose. Only at line eleven does he turn, with an exclamation, "O Wells!", to the person who sent him flowers. That delay is the poem's whole strategy. By first making the wild rose the loveliest thing in nature, Keats gives his final compliment real weight, because the friend's roses beat even that. The central idea is that a gift carries something natural beauty cannot: the feeling of the giver.
The first eight lines form one long sentence, and it takes its time. The main verb, "saw", does not arrive until line five, after a skylark has shaken "the tremulous dew / From his lush clover covert" and spring has sent "adventurous knights" off to "take up their dinted shields". The word "dinted" is a nice touch, since those shields are dented, as if from earlier battles. Keats fills an ordinary country walk with the colours of medieval romance. When the musk-rose finally appears, it grows "as graceful as the wand that Queen Titania wields", a nod to the fairy queen of Shakespeare's *A Midsummer Night's Dream*. Before any roses arrive in the post, the field is already half fairy tale. The rose is also generous. It is "the first that threw / Its sweets upon the summer", and that verb makes the flower sound like a giver, which prepares for what follows.
The turn comes with the ninth line. "As I feasted on its fragrancy" turns smell into eating, and the garden-rose, tame and cultivated, is declared "far excelled" by the wild one. Then comes the surprise: Wells's roses overpower even this. "My sense with their deliciousness was spelled" picks up Titania's magic, so the enchantment of the opening moves from the fairy wand to the friend's gift. The last two lines go further and give the flowers voices. They have "soft voices" that "with tender plea / Whispered of peace, and truth, and friendliness unquelled." Scent has become sound, and perfume has become a message. The roses say what the sender feels, and that is why they win. The wild rose is beautiful, but it says nothing to Keats. These roses speak.
The form supports the argument. The poem is a Petrarchan sonnet. The octave rhymes ABBAABBA (fields, dew, anew, shields, then yields, threw, grew, wields), a tightly closed pattern that suits the self-contained picture of the field. The sestet loosens into alternating rhymes, CDCDCD, with "fragrancy", "me" and "plea" answering "excelled", "spelled" and "unquelled". The lines swing back and forth like a conversation, which fits the move from solitary walking to a message between friends. The metre is iambic pentameter until the very end, where the final line stretches to twelve syllables. The extra length lets the whisper linger, and the closing word, "unquelled", suggests a friendliness that cannot be put down. Sound helps too. The soft s of "sweetest", "sweets", "soft" and "spelled" gives the poem a hushed, scented feel, and the repeated "and" in "peace, and truth, and friendliness" slows the line so each quality is heard separately.
The old-fashioned diction, with "What time", "'twas" and "thy", gives the poem a storybook air that matches its knights and fairies. It is a small occasional piece, written to thank someone, and it makes no claim to be more. Even so, it shows something typical of Keats: the way he treats a physical sensation, here the smell of roses, as the carrier of an emotion. Its quiet lesson is that a thing is valued for what it means as well as for how it looks or smells. Keats makes that point by letting a flower speak, which is more convincing than simply saying "thank you."