I HAVE CIDP, TRACHYCARPUS FORTUNEI, WASHINGTONIA FILIFERA, AND WASHINGTONIA ROBUSTA SEEDS. WANT SABAL PALMETTO SEEDLINGS, OR SEEDS. ALSO LOOKING FOR SABAL MEXICANA SEEDS.

I'm resurrecting this ancient thread, because I think I can help with the first of the OP's questions: where can Washingtonia robusta be seen in its natural habitat? I've linked a paper which answers this very question. The short answer is that the most northerly natural populations are in the area of El Marmol and Catavina, Baja California, about 220 miles southeast of San Diego. I scaled off the distance from a map that shows the distribution of the four fan palm species on the Baja California peninsula (W. filifera, W. robusta, Brahea armata, and B. brandigeei). W. robusta also grows at other scattered sites further south, down to the tip of the B.C. peninsula. The authors used Google Earth to identify palm populations in so. Calif. and Baja Calif., supplemented with field work by others and their own survey from aircraft for areas that were not covered adequately by Google Earth. The authors identified more than 15 thousand palm populations, consisting of an estimated 1.3 million plants. Before someone sniffs that it's impossible to find palm groves in Google Earth, I suggest they download and study the paper and start their own searches in G.E. I found that it was quite easy to locate many groves, and it's possible to distinguish B. armata from Washingtonia spp. W. filifera and W. robusta cannot be distinguished from each other in Google Earth, but there's a gap between their natural ranges. Washingtonias south of the Sierra San Pedro Martir are assumed to be W. robusta. You can verify your new-found skills by studying known groves in California. As one works with the paper and studies Google Earth, some interesting facts emerge. For one thing, although we tend to think of W. filifera as being rare and oh-so-precious in its few easily-visited natural oases in the U.S., it is in fact quite abundant. There are many plants in inaccessible canyons above the well-known sites, particularly in San Diego Co. In Baja California there are vastly more of them in canyons in the Sierra Juarez. The most famous oasis is Canon de Guadalupe, south of Mexicali, but there's a major drainage north of Canon de Guadalupe that has at least as many palms (hundreds, maybe thousands). Also, there are natural populations of W. filifera west of the mountain crest (Valle de las Palmas and Ojos Negros), and these are not very far south of the U.S. border. Another interesting fact is that Brahea armata comes within about 20 or 30 miles of the U.S. border. B. brandigeei is common in the southern mountains (e.g Sierra La Laguna), but for me those are harder to find than the other species. Here is a link that might be useful: Palms in Baja California

The big washingtonia in picture #1 has about 4' of trunk and Is about 9' to the tip of the tallest leaf - not sure how big the pot is, but it's huge. The smaller ones outside are the same age but much smaller (14" pots and are extremely "jacked up"). The other palm in in photo #1 is a betal nut palm - about 10' to tallest leaf including a 16" pot. I've accumulated loads of plants over the years - half winter over in the garage, less cold hearty in the basement under artificial light. I'll post more photos in the future (this is the first time I've been on garden web in years) Best, Rob

@Brad K Overall, yes. There are fewer of them here in Florida than Washintonia robusta for that reason. If you grow a bunch of them from seed, you'll get a few filifera that tolerate humid conditions a little better and survive to adulthood in humid climates. The remainder typically damp off.