noun
water pepper; Persicaria hydropiper
A plant species with a peppery taste, sometimes used as a spice. The name is usually written in katakana.
ヤナギタデは湿地に生える植物です。
Water pepper is a plant that grows in wetlands.
ヤナギタデの葉には辛みがあります。
The leaves of water pepper have a spicy taste.
The name ヤナギタデ (柳蓼) literally means 'willow water pepper', likely from the willow-like shape of its leaves. The exact historical derivation is uncertain.