Whew! The "Night" part of the Night-and-Day blend finally bloomed. The "day" started a few days ago. It's a very pretty golden yellow. I'd been looking forward to what a "mahogony" nasturtium would look like. It's an attractive deep orange. Not really quite as dramatic as "night and day" sounds, but pretty enough.
Maybe next year I'll buy some whirlybird nasturtiums and see how they look.