I have a non irrigated sliver of my lot between my lot and the neighbors. It's on a southwestern facing slope, which is ideal.
Since it's not irrigated, it has ample opportunity for good seed/soil contact since it is sparsely populated right now.
I bought a pound of seed, scarified, and I'm going to plant it this weekend. A pound will cover about 2000 square feet.
I plan to supply water in the fall to get it to germinate, and we'll just see what we get.
If these germinate and flower, I will buy another pound next year so that I've got two years of seeds that should germinate at a high rate, and hopefully that will be enough to establish a stand that can go on their own.
In my conversation with the "seed guy", he said that he would expect this to do well if I take care of the water. He said cold winters should have no negative impact. Droughts would have more impact, but I can control for that.
I'll report back in the spring.