To spot the difference between Kharif and rabi crops, you must figure out when the crop has been sown.
If the crop is sown at the beginning of the Winter season, it is a Rabi crop (Examples – Wheat, Cereals, Linseed, Barley).
If the crops are sown at the beginning of the Rainy season, it is called Kharif (Examples – Cotton, Bajra, Sugarcane, Jowar, Maize)