Rice (Oryza sativa) cultivars Taiken 8 and Tainung Sen 20, water caltrops (Zizyphus mauritana) and Indian jujube (Trapa natans) cultiver Honey Date were used to study the effect of lighting by mercury lamp and/or high pressure sodium lamp during the night on the growth and flowering time. It showed that lighting treatment during nighttime period resulted in a delay of flowering in both rice and water caltrops plants. However, early flowering was observed in Indian jujube plants when treated with sodium lamp all night. Results obtained from this study may be useful for selecting crops cultivated along the sideway of the Second Highway in Taiwan.