This plant grows like a weed with no problem. It does not die back in winter although it is deciduous. The thing to remember is, contrary to what some nurseries tell you, DON'T cut it back in the Spring. The plant flowers in June and new buds form in August, so the plant should be cut back right after flowering. It needs to be cut back every year as otherwise it grows spindly but, if it is cut back in the Spring, it won't flower that year. It grows very big and grows very easily from cuttings. It is a lovely plant with fabulous flowers. Enjoy!

I was also planning to grow it, but could you elaborate about it's growth. Does it spread?

I planted one last year. Did no pruning and have buds started since last week. It is about 18 inches high - same as when I planted it last year. I don't think it suckers or anything and from what I researched it grows like a normal bush.