giant goldenrod; late goldenrod
Refers to Solidago gigantea var. leiophylla, a tall perennial herb in the aster family, native to North America and naturalized in Japan.
Giant goldenrod blooms with yellow flowers in autumn.
Solidago altissima, a closely related and more common invasive goldenrod in Japan; often confused with オオアワダチソウ.
Katakana spelling is standard for this plant name; usually written in kana.
Kanji spelling is rare and mainly used in botanical contexts; learners will almost always encounter the katakana form.
The Japanese name literally means 'large bubble-standing grass', from 大 (large) + 泡立 (bubbling) + 草 (grass), likely referring to the appearance of the flower clusters. The exact naming origin is uncertain.