The leaves of this plant (a campion) are almost yellow, that's why it's called a Golden Campion.

Ray's Golden campion is derived from a common European wildflower and in the spring it bears hot pink flowers that contrast against the chartreuse (yellowish-green) foliage creating a very unusual combination. This campion prefers damp alkaline soils but will tolerate most garden settings provided it is kept watered during dry periods. it grows to about two feet tall and two feet wide.