All citrus respond to heat, but grapefruit especially so. Environmental factors affect the composition and quality of grapefruit. The importance of temperature to grapefruit growth has been strikingly demonstrated. Grapefruit is outstanding in the difference in time required for the fruit to mature under different climatic conditions. Flower buds on the trees come to full bloom and set fruit at approximately the same time at Riverside California and Brawley, California, but about 15 months are required to mature the fruit at Riverside and only about 7 to 8 months at Brawley. The shortening of the time required at Brawley is chiefly owing to the excessive heat units, which accelerate the reactions of growth and elaboration of food materials.
Millet