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沙田柚的花芽分化一般始于9月中下旬,至翌年2月下旬或迟到3月中下旬,历时5—6个月。分化程序及形态特征与柑橙一致。不同之处在于沙田柚花芽生理分化期提前,花瓣、雌雄蕊分化延后。分化部位主要集中在树冠中下部的一年或一年以上的无叶或有叶细弱枝的春梢上。温度影响花芽分化。
Shatian pomelo flower bud differentiation generally begins in late September, late February the following year or late in late March, lasted 5-6 months. Differentiation procedures and morphological characteristics consistent with the citrus. The difference is that Shatian pomelo flower bud physiological differentiation in advance, petal, stamen delayed differentiation. Differentiation sites are mainly concentrated in the lower part of the canopy of one year or more leafless or leafy branches on the spring shoots. Temperature affects flower bud differentiation.