Bi-coloured broom now just yellow! Why?

[Birdie Wife]

I took a cutting a couple of years ago from a lovely bi-coloured (purple and yellow) broom plant. The cutting rooted and this year is flowering for the first time. Except the flowers are plain yellow!! I wondered if anyone out there knew why, as the theory would have it that cuttings are clones of the parent plant and therefore should flower exactly the same?

[Madasafish]

I suspect the multi coloured one is a graft onto another rootstock. Our broom died and seeded.. two plants from seed..one is multicoloured.. one is yellow...

[Birdie Wife]

Strange! The cutting was taken a natural looking woodland next to a river where we were wild camping. Maybe it wasn't as wild and natural as we had thought!