BTW, I should have been specific about hummingbird interest. Lots of red things might attract a hummingbird...begonias (devoid of nectar BTW), a red shirt, red hat, etc. But I'm looking for confirmation of actual use... where they're actually repeatedly getting nectar from the flowers. I think far too often in the plant industry things just get accepted as fact and repeated widely. Red four o clocks look for all the world to be perfect for hummingbirds. The birds will check them out. But they have nothing to offer so the birds moved will move on.
