Washingtonia Robusta questions
I have spent what seems like days on various search engines trying to find out where Robustas can be found in the wild in the natural habitat. I usually get a broad definition of "Baja California and Sonora" and little else.
I figure that they would grow in moist soils with plenty of water available, just as the Filifera do. This would mean they would probably be in what few perennial creeks there are that flow out of the mountains down the middle of the Baja, but thus far I have only confirmed their location at the creek that runs through Catavina. Has anyone seen any other than there?
The second question has to do with growth rates; my friend in San Bernardino has five of them in his yard that have not budged more than six inches in any direction for about five years. I know for a fact that he does not irrigate them, and they are only about five feet tall right now, so I can't imagine they would have deep enough roots (even when fully grown, judging from their oasis origins) to tap what little natural groundwater would be down around his neck of the woods... er... semi-desert. Should these things be getting a helping hand now and then?