Well, in focusing more and more on things I'm sure will survive here, I'm straying a little bit with this question... Still recovering from Zonal Denial Disorder. ;-) Reading up on hardiness of some palms, Caryota Urens, for example, I'm reading hardy to 22d F. Lovely, but is that a sustained temp of 22 degrees, or is that more the kill point? Main reasona I ask is that I have several quite nice palms ni my neighbourhood that IU'm led to believe should never have survived here to begin with. A lovely Chinese fellow up the street has six or eight Bottle Palms, Hyophorbe lagenicaulis, which are rated to Zone 10, with a minimum temperature of 28 degrees F. We hit 22 degrees a couple of nights this past winter, and not a one of these trees was phased in the slightest. No leaf burn, no death, nothing... So, I'm confused... Any insights on this one?