noun
bigleaf periwinkle; greater periwinkle
A flowering plant (Vinca major) often used as ground cover.
庭にツルニチニチソウが咲いている。
Bigleaf periwinkles are blooming in the garden.
From 蔓 (tsuru, 'vine') + 日々草 (nichinichisō, 'Madagascar periwinkle'), referring to its vining habit and resemblance to the periwinkle.