Only reason I can think that would make any sense would be if the plant were an exotic hybrid for which seeds were no longer available. But I only tried it that one time, and I do live in the frozen northland. Maybe that works better in other climates? And somewhat off topic, I tried saving the tubers from some yellow 4 o'clocks that I particularly liked. Over wintered them with no problem, set them out in spring the following year. And again, the plants I grew from seed did much better. Weird.
