Wheat, potato and henbane are 

Long day plants require a photoperiod of more than a critical length which may vary from 4 to 18 hours. The best flowering of long day plants usually occurs in a continuous light. For flowering, they require either no dark period or a very short dark period. Examples of long day plants are- spinach, radish, lettuce, wheat, maize, potato, opium poppy, henbane etc.