Mangzhong or Grain in Beard, 9th of the 24 solar terms 二十四節氣|二十四节气 6th-20th June
Definitions (Wiktionary)
name
the 9th of the 24 solar terms around June 5th, 6th, or 7th, marking the end of the grain-growing season and reminding the farmer that it is the last chance for sowing