Exoten und Garten Forum
Hardy Palm and Subtropical Board
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Jim
Message from Jim in Iowa
Slope frost heave...
The dry conditions were for Trachys,Brahea(not tested)
Washys(desert palms) etc...Sabal and Needle palms were kind of different if
I recall correctly and didn't seem to need to be as dry.
The Needle palm may be an outlier though.