Red beans take only about two months to grow to maturity, and in Wantan are often grown in rotation with rice, in the gap between the first and second growing seasons.
生長期約兩個月的紅豆，在萬丹鄉常與稻米輪作，平時利用第一、二期稻作中間的土地休耕期播種，不但可以增進土地的利用率，也能因豆類栽培而增加土壤肥力。