When roses bloom My senses throb with keen delight; When roses bloom Their beauty soon dispels the gloom Of cares that worry and affright; On wings of joy my soul takes flight, When roses bloom.
Roses are the whole subject here, or rather what they do to the speaker. The moment they bloom, her senses "throb with keen delight," and the feeling is strong enough to push out whatever has been weighing on her. The poem names those weights plainly: "cares that worry and affright." Against them, beauty works almost like medicine, quickly dispelling the gloom. By the end, her soul takes "flight on wings of joy," a lift from heavy to weightless.
The form does a lot of the work. A rondelet is a short, tightly built poem, and its defining trick is a refrain: "When roses bloom" opens the poem, returns in the middle, and closes it. Each return feels like another burst of the same happiness, as if the speaker can't stop saying it. The mood is bright, uncomplicated and grateful, with a gentle, almost song-like rhythm that mirrors the lightness she describes.