Audrey, thank you for sharing your interesting article. I've a guava tree in the back yard that's not yet producing any fruits in the past years. Though, the tree has yielded many attractive flowers in years past. So it's time for me to do more research on pollination for this particular tree. Here is a picture of the flowers last spring. The tree makes flowers the same time Promagranate and Cotoneaster were blooming in my garden.
Thanks for the photo and the information. It sounds as if the feijoa might even be somewhat hardier than the PlantFiles indicate. Of course, in cooler zones, there's probably a larger chance of the buds getting nipped by a spring freeze. But, as that can happen with perfectly hardy fruits too, I think it's still a gamble worth taking.
Audrey, I too was surprised with delight to have found that the plant survives our climate. After all, perhaps this is a case in point; one of the Uncommon Fruit Trees for Adventurous Gardeners ? :) As far as the buds getting nipped by late frost. Actually, by the time these produce flowers it was long after last frost occured in our regions. I'm pretty sure, it's a pollination issues. I'm working on this hypothesis, and will return with future update.
I'm glad to share my experience, hopefully other gardeners can benefit from mine (findings/experiences).