There's a Chinese Fan Palm (Livistonia chinensis) growing in the Brooklyn
Botanical Gardens. It's been there for many years and somehow it has
survived. Sabal Palms (Sabal palmetto) grow in North Carolina. You might
have a chance at those. Many of the Chamerops species are grown for
interiorscape use. And last but not least, There are Bottle Palms (Hyophorbe
lagenicaulis) growing in the AirLink train station by Newark Airport.
I googled hardy palms at Brooklyn Botanical gardens, because this species
(livistonia chinensis) just struck me as wrong (ie, it dies in north
florida). The only hardy outdoor palm I can find listed for BBG is
Rhapidophylum hystrix - the needle palm native to southeast US. There are
apparently 10 specimens of this living at BBG outdoors.
Other potential palms for very protected sites in zone 6-7 might be the
windmill palm and the palmetto.
There is a gentleman in Colorado Springs, CO that grows palms that are cold
hardy. His website has a lot of information on this as well as links to other
places where this palms have been grown successfully.
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