noun
French marigold; Tagetes patula
Most common meaning; refers specifically to the French marigold. Often written in kana.
See also: マリーゴールド
庭に孔雀草を植えた。
I planted French marigolds in the garden.
noun
plains coreopsis; Coreopsis tinctoria
Less common; refers to a different plant species. May be encountered in gardening or botanical contexts.
孔雀草はハルシャ菊とも呼ばれる。
Plains coreopsis is also called ハルシャ菊.
noun
northern maidenhair fern; Adiantum pedatum
Rare botanical use; refers to a fern, not a flowering plant. Usually called 孔雀羊歯.
See also: 孔雀羊歯
孔雀草はシダ植物の一種を指すこともある。
孔雀草 can also refer to a type of fern.
Literally 'peacock grass', from 孔雀 (peacock) + 草 (grass, plant). The name likely refers to the showy appearance of the flowers or foliage.