long island is like 7a , so going by their description its only a "maybe" for me...dont think i'd be seeing 20' tall collard vines lol.you're down in a good climate for them.
.hopefully it'll at least overwinter .i'll propagate a bunch of clippings if i can just in case.
john kohler has a lot of these things growing and they seem pretty cool'. been thinking about trying them for a while kinda . heres a vid of his on propagating them