Southern California, on the edge of Los Angeles, that is.
One variety has been a bit invasive, to the point I sometimes use the (you should excuse the expression) four-letter word "weed" to describe it. Very pretty weed, but I sometimes wish I'd used greater vigilance in either pulling out the stems before the seeds ripened, or pulling up seedlings the following year.
I note that most of the varieties/cultivars I'm growing tend to go dormant to the ground, or at least stop blooming, during both the hottest and the coldest month or so of the year, but have two periods when the masses of flowers are quite reliable. Also, some varieties appear to resent root disturbance, and may sulk for a year or two before getting established.