《梦溪笔谈·药议》
只不过二月草已发芽，八月草叶未枯，采集的人容易辨识罢了，在药性上都不是好时候。
但二月草已芽，八月苗未枯，采掇者易辩识耳，在药则未为良时。
It's only that in February the herbs have sprouted and in August their leaves have yet to wither, so it's easy for the person who collects them to identify them. But in terms of their medical properties, neither time is right.