I'll add that P. pacifica and P. thurstonii do grow fine out here in the desert around Palm Springs. I have a couple of P. pacifica (purchased from a nursery in Florida) in the ground and a P. thurstonii that I sprouted from seed I collected from the tree at our former house on Big Pine Key, and after four years it's still strap-leaf and still in a container. Both grow fine here, though I purposely keep P. pacifica under canopy to avoid the leaf-damage that occurs under open sky on cold nights. It has been documented both in Florida and SoCal to be relatively bud-hardy but leaf-damage occurs under open sky somewhere in the low 40s. Out here in the desert it throws new leaves so fast in spring and summer that by June-July it has a nice head of new leaves, although I haven't seen any real damage growing mine under canopy despite temps into the low 30s F. Also Matt Bradford I believe did grow one at his house in San Diego but winter damage to the leaves and slow recovery in the cool spring and summer meant a result of diminishing returns for him, so he removed it, and documented this in a post on the forum here. While I haven't seen any results about P. thurstonii in the coastal plain or fogbelt (zone 24), it is definitely a slower grower than P. pacifica for me here. I noticed this in the Florida Keys as well. It is certainly correct that at least P. pacifica is not recommended for the coast and coastal/interior valley areas. The great thing about the Hawai'ian Pritchardia species is that there are so many of them and they occupy such different niches, elevations and windward/leeward locations, sun, cloud, rain, dry, etc., that there are species for many different climate zones in California. When I lived in Los Feliz (eastern Hollywood, Los Angeles), I grew a Pritchardia beccariana that thrived, and it got quite tall after we moved across town, though it is gone today. I'm sure this was due to purposeful removal and not cold damage. It went through the 1990 freeze with no real problem at all, while young Royal palms and other plants around it were killed.