The period from flower opening, pistil and stamen exposed from perianth to completion of pollination and fertilization and flower withering.

Generally speaking, the growth process of flowers is mainly divided into three periods: one is vegetative growth period, the other is reproductive growth period, and the third is dormancy period. The vegetative growth period is divided into broad sense and narrow sense. The dormancy period is divided into short dormancy period and long pruning period. The reproductive growth period is relatively complex, including flower bud differentiation period, flowering period and fruiting period. The flower bud differentiation stage can be divided into physiological differentiation stage, morphological differentiation stage and sexual cell maturation stage. The flowering period is divided into initial flowering period, full flowering period and final flowering period.