breeding ground

a place where animals breed or to which they return to breed.
an environment suitable for or fostering the development of an idea, thing, etc.: a breeding ground for violence.

1930–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The swamp was a breeding ground for malaria, and the disease was killing off
  the population.
Clique membership is the perfect breeding ground for this kind of behavior.
GE prides itself on being a breeding ground for exceptionally talented managers.
Academe, however, is a breeding ground for such psychological and actual
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