The speaker is stuck in a creative or mental dry spell. Their brain feels like parched ground, and instead of complaining at length, they ask quietly for relief: "might need a little rain." The tone is modest and almost casual, which makes the plea feel honest rather than dramatic.
The poem leans on one extended image. The mind is a garden, thoughts are the plants, and the lack of ideas is a famine and a drought. Those last two words are heavy ones, so there's a small gap between the gentle opening and the real sense of need underneath. The speaker may be joking a little at their own expense, but the repeated line "end the famine" sounds like a chant or a prayer, as if saying it twice might help make it happen.
The mood is weary but hopeful. Everything is dry, yet the speaker still pictures a garden that could grow again. Short lines and simple rhymes (rain, drought, thought) keep it light, even as it describes feeling empty.