"An "invasive species" is defined as a species that is non-
native (or alien) to the ecosystem under consideration and whose
introduction causes or is likely to cause economic or
environmental harm or harm to human health. (Executive Order
13112). Sometimes you will see invasive species referred to as
exotic, alien, or non-indigenous species. The problem with these
names is that they only refer to the non-native part of the
definition above. Many exotic or alien species do not cause harm
to our economy, our environment, or our health. In fact, the
vast majority of "introduced" species do not survive and only
about 15% of those that do go on to become "invasive" or
harmful. An invasive species grows/reproduces and spreads
rapidly, establishes over large areas, and persists. Species
that become invasive succeed due to favorable environmental
conditions and lack of natural predators, competitors and
diseases that normally regulate their populations." Although it
is not listed as invasive in California, you should