Usually considered the cold-hardiest of all palms, Trachycarpus is an unbranched palm with deeply-lobed leaves to 30" long. In theory, the tree can grow to 50', but it grows quite slowly, especially in cold climates. If you're planning to try growing one in a cold climate, you should probably grow it in a pot and bring it indoors for a few years, until the trunk develops the heavy fibrous covering that protects the core of the tree from cold.

 

Trachycarpus fortunei 4" pot $5.00