Annual crop definition Crops that take not more than one year to mature Classification of Crops There are two major methods of classifying crops plants Botanical classification which is based on the morphological similarity of plants parts Economic classification is based on their uses 1. Botanical classification The grass family The legume family 2. Agronomic/economic classification Cereal or Grain crops Legumes Oil crops Root and tuber crops Fiber crops Forage crops Vegetable crops Rubber crops/latex crops Beverage crops 3. Special-purpose Classification Cover crops Botanical, agricultural or special classification