In just a few lines, a rosebud speaks for itself. It rises in a field, calling itself "a little angry heart," and says it is the rose that someone once sought all summer. The "you" in the poem is never explained, but the speaker seems to be addressed to a person who used to look for this flower and perhaps no longer does, or who searched for it and missed what was right there.
The feeling is a mix of pride, hurt, and fragile hope. The anger is small, like the bud itself, and it sits beside a plain statement of being: "I am a flower here." Then comes the quiet final line, "green for a day." The bud is still unopened and unfinished, and it seems to know how short its time is. That gives the poem a tender, slightly wistful mood. It feels like a brief flare of feeling in a wide field, both defiant and aware that it won't last.