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Posted:  20 Feb 2012 21:42   Last Edited By: number2211 
I'm in Canadian zone 5b (roughly USDA zone 6).  There's a building in downtown St. John's, NL that has some palm trees growing outside on a rooftop.  No one around here can give me any information on them, including the people who own them.

I've checked with suppliers, and they have no information either.  I'm about to google the topic, but thought it wouldn't hurt to ask on here.

Does anyone have any experience with them?  Did anyone find a certain species better than another in some capacity (disease resistance?  Drought tolerance?)

Thanks in advance!
Posted:  21 Feb 2012 02:05  
Could be Needle Palm (Rhapidophyllum), Windmill Palm (Trachycarpus), Mediterranean Fan Palm (Chamaerops) or Palmetto (Sabal).  All are hardy down to about -10 to -15 degrees Fahrenheit, although some may need winter protection.  The Palmetto has an underground trunk and so is inherently hardier than those that do not possess this feature.  Heavy mulching and/or wrapping of the trunk may be necessary to overwinter these palms near the limits of their zone range, and they cannot be planted outdoors until they are a few years old from seed.  Without a photo I can't say for sure which it might be, but if you Google the abovementioned palms, you can see photos to help with the ID.  Med Fan Palms are VERY drought resistant (and sculpturally beautiful), and Windmill Palms are reportedly hardy to northern Scotland.

Posted:  24 Feb 2012 15:26  
You can identify the palm by 'keying it' out. Typically a key would ask a question after question and gradually work to a specific ID. I will attach a link. Hope it works.
<a href="http://www.plantapalm.com/vpe/palmkey/ldsppalmkey/ldsppalmkey1.htm">Key </a>
Posted:  24 Feb 2012 15:28  
I see that it did not work. However, if you copy and paste the URL, it should take you there.
Posted:  29 Feb 2012 23:44  
Thanks for the help, folks!

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