Rejoice in it as a foliage plant! Big lush leaves with a red central vein on a reliable herbaceous plant to 10 ft tall each year.
I have flowered it once.
It has the typical anticlimactic Gynura
irregular shuttlecock of orange/yellow small flowers in the early spring on overwintered shoots.
I can't find a picture of mine in flower - I guess I was never excited enough to take one!
The following picture is of it in bud this January. It was decimated by gales a few days later. Any frost stops it flowering.
Gynura cusimbua in bud.
The species is sometimes 'sunk' into C.bicolor, and that is an edible leaf vegetable.
If anyone wants one I can bring it to The Tregrehan Rare Plant Sale