Just in case you are serious too, desert island refers to a place of litte or no habitation (thus the word 'deserted').
And of course trees grow in the desert, The Joshua tree being the most famous example.
All I need on my desert island (apart from the supposed DVD player and sound system) is a few rocks that I can carve into useful tools and then I can begin my boat building exercise.
Ellen should be a good help there too, even if she is as dry as a camel's leg.
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