I grew them two years ago from seed. I started them in jugs outside, like winter sowing but I waited until late April to do it. They were slow to start. They grew nicely over the summer but I did not get blooms until the end of summer. I love love loved them! But was sad it was for such a short time. I do not start any seeds indoors. But perhaps if you did you would get mature plants sooner and hence blooms for the summer.
I got my seeds from Summerhill.
