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通过连续３ 年观察，板栗雌花簇在河北邢台地区从４ 月中旬开始分化，６ 月中旬结束，分化过程约需６０ ｄ。分化过程可分为７ 个时期：雌花簇分化始期、雌花簇原基分化期、花朵原基分化期、柱头原基分化期、柱头伸长期、子房形成期、开花期。
Through three consecutive years of observation, female chestnut flower clusters in Xingtai, Hebei region began to differentiate from mid-April, ending in mid-June, the differentiation process takes about 60 d. The process of differentiation can be divided into seven stages: female flower cluster differentiation, female flower primordium differentiation, primordium differentiation, stigma differentiation, stigma elongation, ovary formation and flowering.