Tháng năm ngọn già, tháng ba ngọn non
Direct English translation
In the fifth month the shoots are old, in the third month the shoots are young.
Giải thích tiếng Việt
English explanation
This proverb sums up folk experience about seasonal plant growth: around the fifth lunar month the tips or shoots are mature, while around the third lunar month they are still young. It is used in traditional knowledge about timing, cultivation, and the harvesting or use of plants.