A gorgeous species - so much better (in my humble opinion) than the more commonly available G.officinalis types and sometimes mistaken for some sort of herbaceous Wistaria. The combination of intense violet blue and fresh green is just stunning. There is the slight down-side in that it runs underground but I've never found it rampant and the foliage works in so well with other plants it's hard to object. Any soil in sun.
2L pots ~ £8