蜂在采集花蜜时，对花朵是有选择性的。一般含苞或是刚开放的花，蜜蜂是不进行采集的。它的采摘对象是盛开的花朵，因为此时花蜜或分泌物的含量是比较丰富的。

Bees are selective to flowers when collecting nectar. Generally, bees do not collect flowers that are in bud or just open. Its picking object is blooming flowers, because at this time, the content of nectar or secretion is relatively rich.