Tropical hummingbirds favor them :-) But they are not an easy plant to grow outside of their hardiness range and there are so many other hummingbird attractant plants suitable for a zone 6 garden that I'd be hesitant to seek out one just for that purpose. Unless YOU were specifically looking for big, dramatic but quite temporary flowers yourself to enjoy.

Have you considered growing any of the hardy hibiscus, like Hibiscus moscheutos or the hybrids? These should be perennial in a zone 6 garden.

If it's just for the hummingbird, I would say no also, and for the same reasons. Plants in your zone or even a couple of well-placed feeders can supply the birds with the nectar they need.

Thanks for not enabling me! I have enough plants...