Grand growth phase starts from 120 days after planting and lasts up to 270 days in a 12-month crop. During the early period of this phase tiller stabilization takes place. Out of the total tillers produced only 40-50% survive by 150 days to form millable cane.

Most important phase of the crop wherein the actual cane formation and elongation and thus yield build up takes place.

Leaf production is frequent and rapid during this phase with LAI reaching around 6-7.

Under favourable conditions stalks grow rapidly almost 4-5 internodes per month.

Drip irrigation, fertigation and warm, humid and sunny climatic conditions favour better cane elongation. Moisture stress reduces internodal length. A temperature around 30^oc with a humidity of around 80% is most conducive for good growth.