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I was excited to read this, as I have a potted Dasilylirion. I'm not certain of it's species...I think it's the acotriche, as that is the one I'd searched for when I purchased this one...but I believe I've lost it's tag.
Mine is several years old, though very far from 'trunking'.
I take it outdoors during the summer and lug it back to the basement each winter...it's puts up with an astounding amount of neglect...it's been in the same pot for all these years. (10")
If I had a sunroom or even *more* room indoors (Ü), I'd re-pot it, but so far it's doing pretty well, considering.
crimsontsavo, if you can keep it from getting too soggy in the winter (like under an overhang or in really, really good draining soil on a slope), I'll bet you could grow Dasylirion wheeleri in the ground in your zone 7a garden!
He's got D. michiquanensis (listed as zone 7b-10 guessing!), D. quadrangulatum (which I've almost never seen for sale...zone 8-10), D. treleasei (which is supposed to be *very* rare, but which *I* thought was just the corrected name for D. longissimum!...zone 8-10 guessing) and, of course, the stalwart D. wheeleri (zone 7-10, possible colder).
BTW, if you like these guys, it's worth pursuing their close relatives in the genus Nolina. I've seen Nolina microcarpa growing in bone-dry rocks in Northern Arizona in a place where temperatures routinely hit -10 F in the winter and where the rainfall in a *good* year was about 4 inches!
My favorite Nolina species are N. bigelovii and N. parryi. Check out this dramatic pic of
Bigelow's Beargrass: http://calphotos.berkeley.edu/cgi/img_query?query_src=photos... And Parry's beargrass is a giant among Ruscaceae with the most astonishing flower spikes in the family..check it out: http://calphotos.berkeley.edu/cgi/img_query?query_src=photos...
Plant Delights is offering a high elevation collection of an as-yet unidentified species they're calling Nolina 'La Siberica' that is probably hardy to zone 6 if kept dry!
Another source for Dasylirion is Yucca Do Nursery in Texas (http://yuccado.com/) They've got D. michiquanensis and D. quadrangulatum, but they've also got a blue weeper by the name of Dasylirion berlandieri (they also offer two cool Nolina).
I'm sure glad I gave my wallet to a loved one for safekeeping! ;')
