The feijoas in the Fishsauce image above looked scathed to me.
My large, old bush has dropped perhaps 25% of its leaves. Minimum temperature was 23F. Green leaf drop, either natural or by shaking the branches, counts just cold-damage same as discolored leaves still on the plant.
My two first year in ground plants lost all their leaves. We had a mild winter for this area, but we had a few days that hit a low of 10 degrees, which is as cold as I ever see it here.
i have 6 grafted NZ varieties potted plants (3 gallons each, about 2 years old i am guessing from the rootstock) that i had kept outdoors in the low 20s this past winter and they were fine. i only brought them into the garage when it went into the teens one early morning in January when we had snow.
My in ground (1 gallon) New Zealand feijoa planted last spring looked fine through the winter but then dropped their leaves in late March. I think we saw similar low temperature.
They say that a lot of varieties from New Zealand cope better with frost. Maybe yours still need to get more established. Do you know the name of the variety by the way?
I didn’t protect the potted one with plastic wrapping and it was located in a more exposed area. It saw temp low this winter of 6F. I still see some green near the root when doing a scratch test and hoping that it would come back, we’ll see.
That’s severe damage. I hope some of them can still regenerate from the base or something. If the cold temperature lasted for long, it could have gotten to the roots.