Look at my post below under "Washy Update " , and read what I said to Brad . Curly and Shaq died after last winter . It would have been easy to protect them but because the low was only 7F last winter , and I read that Palmettos are hardy to 7F , I wasn't worried about them . What was weird was 9 days below 32F here , and that evidently is too much cold for them . They had experienced 4F before and the fronds were damaged but much of the fronds remained healthy and held some green . Shaq was obviously hardier than Curly which was noticeable every year that went below 7F .
The Birmingham in the pictures wasn't protected and it had some burn but no spear pull . Another Birmingham had spear pull but is growing out well . Two other small Birmys lost all their fronds but had no spear pull and are growing out well .
I did have one small Palmetto , my " Tifton Hardy " survive with spear pull , and it wasn't protected .
I'd say the Birmys are definitely hardier than Palmettos . They can take 9 days below 32F , with damage , but aren't killed .
I wish I had trunk cut Shaq and Curly earlier in March once I saw that they weren't growing out because they might have been alive but the rot was growing into the bud faster than they were growing out ?
If you have any more questions I'll try to answer them as best I can .