The phrase "Who will buy my sweet red roses?" is famously known as a line from the song "Who Will Buy?" from the musical Oliver! The song features a rose seller offering sweet red roses for sale, repeating the line "Two blooms for a penny." The buyers in the song are various street sellers and characters in the musical, including milkmaids, strawberry sellers, and knife grinders, all calling out their wares while the rose seller persistently asks who will buy the roses. The song evokes a lively street market scene from the story Oliver Twist, where the roses are metaphorically sold to anyone willing to buy them, creating a sense of charm and hopeful trade.

So, in this cultural context, "Who will buy my sweet red roses?" is a rhetorical question from the rose seller to potential customers in the market, representing anyone who wishes to purchase the roses.