Guar gum is derived from the guar seed. The primary growing areas in India and Pakistan are the semi-arid regions of Haryana, Rajasthan, Gujarat, Sindh and Punjab. Guar is a traditional crop planted by farmers year after year.
Planting takes place in July and harvesting begins approximately 110 days later. During the growing season, the plant requires only two to three timely rainfalls to ensure proper seed development.
Harvesting is done manually and the seeds are generally separated from the chaff by the ancient method of winnowing. Farmers sell the seeds to small local grain merchants and eventually they are purchased by guar manufacturers.
In the most basic terms, the valuable endosperm or “split” is separated from the undesirable seed hull and germ. The production of guar gum flour is a series of milling, grinding and sifting operations designed to yield the desired grade.