花弁 refers to flower petals.
Alternative reading: 花弁 (more colloquial)
Common expressions:
- 花弁が散る (petals scatter/fall)
- 花弁が開く (petals open)
- 一重 (single-petaled)
- 八重 (double-petaled, many petals)
Counter: 枚
Note:
花弁 is the formal/scientific term, while 花弁 is more commonly used in everyday speech. The poetic image of cherry blossom petals (桜の花弁) scattering in the wind is iconic in Japanese culture.