knotweed; smartweed; jointweed
General term for plants of the Polygonaceae family, especially Persicaria and Polygonum species. Often used in compound plant names.
Knotweed flowers were blooming by the roadside.
Specifically Persicaria hydropiper, a species with peppery-tasting leaves. Also called ヤナギタデ.
See also: ヤナギタデ
Chewing water pepper leaves gives a spicy taste.
water pepper; Persicaria hydropiper
water pepper (Persicaria hydropiper)
water pepper (Persicaria hydropiper f. purpurascens)
dyer's knotweed; Persicaria tinctoria
Katakana spelling is common for plant names; usually written in kana.
Kanji spelling is rare and mostly seen in botanical or literary contexts.
Hiragana spelling is also common; usually written in kana.
The origin of たで is uncertain. The kanji 蓼 is a Chinese character used for these plants.