I found that my Arctic Frost unfortunately did not survive for me. It was initially growing inside, and may have been transferred outside in the ground too early in March. It suffered some severe die-back. Probably had trouble handling the sudden transition from warm rapid growing conditions to colder outside. It was later able to grow out a green branch one and a half feet long with several big leaves on it, but it did not survive through the winter. I do wonder of course if maybe it had not suffered the die-back in the first place, it might have been in a better position to survive through the following winter. But this does seem to demonstrate to me that Arctic Frost does not seem to demonstrate very clear hardiness to cold in this climate. The plant was also growing on its own roots, and was about 2 feet high when planted outside.
Pacific Northwest, zone 8a.
I know jim VH is growing a big St. Ann Early Satsuma tree 2 hours south of here in Vancouver (across the bridge from Portland) but he puts some light protection over his tree with christmas lights during the winter. He has one Changsha mandarin growing outside next to his house that he doesn't protect, on trifoliate rootstock.
I'm sure Arctic Frost probably does better in other zone 8a climates that are not so far north.
Arctic Frost is not as hardy as Yuzu. My little Yuzu tree survived, though it was on Flying Dragon rootstock. The Yuzu even managed to hold on to slightly less than half its leaves, through the winter, and those leaves eventually recovered.
Topic: The Story Of Dr. Moy & Cold Hardy Citrus (Read 1532 times)