I think I may have this in a big container in the front courtyard with patens. I have it in my Trade List, but looking at the locations where I indicated I planted it in the garden, I'm pretty sure what I entered as sagittata is something else. Either that or I lost it all last winter......
Do I recall that it's a little touchy about cold?
I know patens is, which is why I tried putting it in a container where it's more sheltered. Every time I put one of those in the back garden, it freezes. Last year they both came back in the container, but really slowly. I may have to just consider them annuals and get 'em in early!