Three short lines, and a whole small scene: a rose, soaked by rain, sitting still and taking in the water. The poem doesn't say much about the speaker, but the choice of words shows how they see it. The rose "sat and drank," as if it were a person at a table, settled in and in no hurry. That gentle personification makes the rain feel less like weather happening to the flower and more like something the rose welcomes.
Then the last line shifts the tone. "Till night took it" is quiet but a little ominous. Night could simply mean the rose disappears from view in the dark, or it could hint at the flower fading or ending. The poem leaves that open. What comes through is a mood of calm, tenderness and a slight sadness, the feeling of watching something beautiful absorb what it needs while the light goes out around it. The speaker seems to observe closely, without interfering.