The kinnow is a variety of citrus fruit cultivated extensively in Punjab region. It is a hybrid of two citrus cultivars — "King" (Citrus nobilis) x "Willow Leaf" (Citrus deliciosa) — first developed by H. B. Frost at the Citrus Research Centre of the University of California, Riverside, USA. After evaluation, the kinnow was released as a new variety for commercial cultivation in 1935. In 1940, Punjab Agriculture College and Research Institute, Faisalabad, Pakistan, introduced the kinnow. It has become an important variety in the Punjab province of Pakistan, occupying a major part of the area under cultivation for fruit crops.
The kinnow fruit is large and orange, with 12 to 25 seeds and a globular shape. It matures in January or February. This "easy peel" citrus has assumed special economic importance and export demand due to its high juice content, special flavour, and as a rich source of vitamin C. The factors which have contributed to the success of this fruit are its beautiful golden-orange colour (a major asset from a marketing viewpoint), its abundant juice, and its excellent aroma and taste. Its trees are highly productive; it is not uncommon to find 1000 fruits per tree. Handsome returns, much higher than those obtained from most of other fruit crops, can be had from well looked-after kinnow orchards by adopting proper methods of cultivation.