Looked it up. My guess is that its as cold hardy as other Trachys. And with that it should be protected for the first 2 or 3 years. Go for it.

Ive heard that its one of the more tender Trachycarpus and gets damage around the 20s. If you are willing to give ti good protection, I would definitely go for it. I hear better things from princeps which is a really beautiful palm that is suppose to be equally as cold tolerant as the windmill palm.

Good luck!
-Alex

I have a nice sized one but keep it protected from hard frost in winter. They are not supposed to be nearly as hardy as T.fortunei or T. wagnerianus. I would err on the side of caution.

The seller wanted $15 for one,but I got him down to $10,plus $7 for shipping.I figured $17 is a good price for one of those palms.I like the way they look,they look more tropical looking than any other Trachycarpus palm I have seen.I like the princeps,but there pricey for no bigger than they are.At least on ebay.Thanks for the info.

Def agree w/ tropicalzone and njoasis. not close as hardy as Fortunei - Chusan but def a hardy palm when large and acclimated but I think its native to somewhere in India. Very nice looking palm I am not growing one but if you protect it especially really good during the first few years I bet you could have a very nice looking palm, good luck! -Justin in VB

I stand corrected on its hardiness. Nonetheless, I still say go for it. Good luck.

Have not heard of Martianus being hardy past low 20s.

I have had a lot of trouble keeping one of these alive,I have a nice one from the same seller-they sent me a big one!-for the price(-:
I think it may need a little wind protection because of it's more open growth habit-worth a try though.

One caveat is they tend to be a little slow while they are small(maybe even when bigger),this may be the determining factor
in their survival as recovery from spear damage may be to slow for adequate recovery-all that said,go for it!

We had a freeze here in southern California 2007 where it got to 25F for over 7 hours in my front yard (nearly unheard of out here)... burned the hell out of the T martianus, latisectus and nanus (nearly killed all three)... but did not touch the T 'takil' (probably just a fortunei variety), wagnerianus (another fortunei variety) and my supposed Trachy princeps nova.