Refers to the plant Phaseolus coccineus, also known as 紅花隠元 (べにばないんげん). Usually written in katakana.
See also: ベニバナインゲン
I'm growing scarlet runner beans in my garden.
The flowers of the scarlet runner bean are a vivid red.
scarlet runner bean
Katakana spelling is common for this plant name; usually written in kana.
Kanji spelling exists but is rarely used; usually written in kana.
Compound of 花 (flower) and 豆 (bean), referring to the plant's ornamental flowers. The exact historical derivation is uncertain.