银杏雌花芽在贵阳地区从６月初开始形态分化，持续至翌年３月完成。形态分化可分为６个时期：未分化期、分化始期、分化盛期、珠被分化期、珠心分化期和珠托分化期。 Female flower buds of Ginkgo biloba began to morphologically differentiate from the beginning of June in Guiyang and lasted until March of the following year. Morphological differentiation can be divided into 6 periods: undifferentiated stage, differentiation stage, differentiation stage, differentiation stage of pearl, differentiation stage of pearl and differentiation stage of pearl.