在春末夏初，阳光是强大的。
在春末和夏季大气层的突然降温是主要原因。
This was because the atmosphere drastically cooled off at the end of spring and summer.
绿朱草花期在春末夏初。花开时，雄蕊会藏于花房中，给紫色的花朵留出一个“白色眼睛”。
Green alkanet blooms in spring and early summer. Its stamens are hidden inside narrow flower-tubes which end in a white eye in the centre of a blue flower.
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