Not that I'm aware of, but the terrain and climate in this particular area is very harsh...very dry, 100+ in summer, freezing in winter. That might be what keeps them from spreading.
The Brazilian Pepper tree is a terrible pest in FL.
http://plants.ifas.ufl.edu/node/405
I was amazed to see that the CA Pepper Tree is the same genus. Any problems with it becoming invasive in CA?
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