In fact it is not unusual for a change of seasons to occasionally come early or late and upset the sequence of nature, and it is quite common for plants to be fooled by the weather. In ancient times farmers were aware that "if a fruit tree that normally flowers in spring blossoms in autumn, it will not set fruit."
季節變換的偶而提早、延後，導致自然失序，其實並不奇怪，植物被氣候欺騙更是常有的事，古代農民也有「原該春天開花、卻在秋天吐蕊的果樹，不會結實」的說法。