Every single hybrid of Nepenthes, and those of every other CP
genera (sp?) I have experience with, grow larger and faster than
the parent species.  Granted, I don't grow *all* the parent
species of the hybrids I grow but for those I do this holds very
true.  Others I have spoken with report the same.  I would think
that *not* showing hybrid vigor would be the exception.
Dave Evans
P.S. Could a single clone really do that much cloning of it's
self in a natural setting?  Perhaps Darlingtonia could...