During this winter I have noticed a big difference between seed stock of Sabal Uresana and upon further investigation it appears that there are two distinct populations of this species. The costal form is more blue/green in color and from what I can tell is more of a zone 8 palm.  I have had various damage on this species from 100% defoliation on smaller 5G plants in the ground to 75% defoliation on larger 5-6' tall (overall) plants in the ground. There is also a reported Mountain form