From Japanese-English FreeDict Dictionary ver. 0.1:
[news2] [nf34] 蓼 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, [news2] [nf34] たで /tˈäde̞/, () タデ /tˈäde̞/ 1. (noun (common) (futsuumeishi))
Note: word usually written using kana aloneknotweed (Polygonaceae), jointweed, smartweed 2. 柳蓼 Note: word usually written using kana alonewater pepper (Persicaria hydropiper, Polygonum hydropiper)