Lots of both alocasia and especially colocasia will come back in zone 8, many with little or no protection...
Gotta find the right spot, and get a large enough plant established early enough to have a chance, but it's easy enough for me in zone 6 and I know of many growers in zones 7 and 8 that do way better than me!
Dry in winter, lots of water when it's warm, lots of feed or very rich soil will get big leaves.
There's just tons of info on this in this subforum!
