Sunflower suits tropical and sub-tropical climates. The crop needs cooler temperatures during the vegetative phase; temperatures above 38°C during the reproductive stage reduce oil content. It is a day-neutral plant, gives the highest oil yield below 1,500 m altitude, and cannot tolerate drought or waterlogging.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Sunflower – Climate requirement, p. 216
