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Hardy Palm and Subtropical Board
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The islands are mild...but not that mild:
Message from Mike coastal CT
I've done the boat tour a few times over the years.
Most (not all) of the houses out on the islands are seasonal - they move in around early May, and depart in late October or so. So anything out there would likely have to fend for itself. There was a house out there a few years back that had several tracy f. growing against the wall of a house. I don't know if they survived the last two winters. A tree form cordyline might be pushing it though. I would think they would have to be wrapped.
The islands out there are mild though...they can be 20 F warmer then 50 miles inland and at elevation. Some of the islands on the north shore of Long Island also have some subtropical plant growers. There was a guy on the garden forum some years back that was growing some type of palms near the North Fork of Long Island.
Exoten und Garten Forum Hardy Palm and Subtropical Board