stevelau1911

11ft apart sounds safe. If you are in zone 11, your banana canopies will overhang by 8ft or more depending on the species especially if you never expect them to die back.

They are also fairly easy to move since they don't make that many roots.

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I'm in zone 6 upstate NY, specialize in growing temperate cold hardy bamboos(mainly phyllostachys) and starting to get into bananas.

my picture website is http://www.flickr.com/photos/31489820@N02/

http://stevespeonygarden.blogspot.com/