what palms are cold hardy?
["'Bulgaria' Windmill Palm (Trachycarpus fortunei 'Bulgaria') ... ", 'Pindo Palm Tree (Butia capitata) ... ', 'European Fan Palm (Chamaerops humilis) ... ', 'Needle Palm Tree (Rhapidophyllum hystrix) ... ', 'Sago Palm Tree (Cycas revoluta) ... ', 'Blue Mediterranean Fan Palm (Chamaerops humilis v. ... ', 'Bismarck Palm Tree (Bismarckia nobilis)']