Q: Does geographical area affect the color of blossoms, specially reds? I live in Hawaii. All locally hybridized reds seem to be plum or bluish red and same plants from California growers are cherry red.
A: At high night temperatures flower color is less intense because the sugar is used for respiration and anthocyanin pigments are not developed. California night temperatures are cool almost all year, favoring anthocyanin pigment development, whereas your night temperatures are higher, hence the flower color could be less intense.