The boys' grandfather，a traditional Tibetan, searches in his pasture.

Harvest time also means the most dangerous time because natural disasters and accidents may befall pickers, including rolling rocks, drowning, falling from steep cliffs and being struck by lightning. A mother was killed by a falling rock when she and her child searched for the herb and the child was seriously injured. Last year, a 7-year-old was stuck by lightning and lost his life.