This is a favorite of mine. I initially wintersowed the seeds, probably about 8 years ago. I found that they self sow pretty well so I haven't had to bother sowing them for the past few years. I generally get a few volunteer plants each year. The volunteers sprout late, and the seedlings closely resemble a common weed that grows here, so I have to be careful not to hoe them out by accident. And since they sprout late, they also bloom late- not until late August or September. By that time most of my plants are dying off or going dormant. The hummingbirds love them, and they are in bloom after some other favorite nectar sources are finished for the year.
Karen