noun
lush waterside reeds
Refers to green, thriving reeds growing along water, often with a poetic or seasonal feel. The term is somewhat literary and may appear in haiku or nature writing.
池のほとりに青葦が風にそよいでいる。
By the pond, the lush reeds are swaying in the wind.
葦 is the general word for reed, while 青葦 specifically emphasizes the fresh green color and lushness of waterside reeds.
Compound of 青 (あお, 'green') and 葦 (あし, 'reed'). The exact historical derivation is uncertain, but the term is conventionally associated with the image of verdant reeds in Japanese nature poetry.