I had a couple of what the nursery called Colorado Four O'clock. Possibly one of the hardiest plants I've had. Planted in my full sun xeric area next to the sidewalk. Walkers would comment on them even though they only opened their blooms later in the day. Unfortunately, they self seeded like mad and there were so many blossoms it would have been impossible to dead head. I finally removed them for that reason and had volunteers for a couple of years afterward. If my experience is anything to compare, I'd think they should do well from seed.