The humans were threatened by the rise and fall of sap levels and rarely left the plants but climbed up and down inside where they lived at different levels inside. I read this about 25 years ago but grateful for any ideas.

2 Answers 2


This sounds like the final chapters of The Genocides by Thomas M. Disch (aliens seed plants on earth that kill all other life - a few remaining humans flee to live inside the plants). A superbly written book (and a contender for the 1965 Hugo Award) but incredibly depressing (pretty much a scifi version of Lord of the Flies on steroids).

  • Thanks, I've looked up this book and it sounds like the right one!
    – Flora
    Nov 9, 2013 at 8:11

Could also be the The Integral Trees By Larry Niven http://en.wikipedia.org/wiki/The_Integral_Trees

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