The speaker offers a very small, very odd remedy for a low mood: buy a hamper of melons. The poem is addressed to "my love," so it feels like a private gesture, something said across a kitchen table or held out like a gift. The speaker calls the idea a "rare vision," as if it were a sudden insight, yet the answer is almost comically simple. Peace of mind isn't found in anything grand, just in a basket of fruit.
The tone is light and playful, but there's tenderness underneath. Melons suggest ripeness, sweetness, summer and plenty, so they stand for small pleasures that can lift a heavy heart. The word "buy" adds a gentle joke, since ease of mind is treated like something you can pick up at a market. The poem may not really claim that fruit cures sadness. Judging by its warmth, it seems to say that care, generosity and attention to simple things can help, and that sharing them with someone you love matters most.