Andrewr grows this. It's a perennial for moist soil in semi shade. I don't think it has any preference for acid/alkaline soil. It grows up to four feet, so it might need some support. It flowers in summer - you'll see his photos at the bottom of the page.

I only planted this last spring so I've only been growing it for one season. Unless it is in a very sheltered position, I would be inclined to support it - I put in a short cane and loosely tied it to that. Flowering period was about three weeks from memory

I have had the native /wild flower in an earlier garden. It got to 3ft and i never staked it. it was in full sun in a chalky moderately moist soil. the flowers lasted between 2-4 weeks depending on how wet it was.
I dont grow it in my current garden but it was a pretty plant.