I have Duane, many times. The down side to that is that they don't bloom until the second year. Last year I used this method (inside, germinating in vermiculite in January). They did great.
May 2013
And lots of blooms by July
And by means of comparison: Last May, WSown echs in the jug on the left, indoor seedling on right
I had great success with WSing for 7 years. Last year was so cold, cloudy, and rainy, that I had dismal results.
Karen