Rabi is the spring harvest or winter crop in India. Major rabi crops in India include wheat, barley, mustard, sesame, peas, etc.
Some varieties of wheat are known as spring wheat while others are called winter wheat. Former variety is sown and planted in spring and is harvested by the end of the same reason. However, winter varieties, if planted in spring, fail to flower or produce mature grains within a span of a flowering season. Explain, why?