Xeramtheum, if you're open to suggestions, zaluzianskya capensis is lovely with the Datura. The flowers are appropriately white with dark markings, and super-fragrant. I underplant potted Datura with this and helichrysum, dichondra, or plectranthus, it's one of my favorite annuals to pop in a mixed pot for fragrance. I generally start 24 of them a year, and wish I'd started more.
