Freedom demands that borders be as porous as possible. Open borders allow for cross-pollination and exchange; ironclad borders are expressions of totalitarian control. And generalized prohibitions on "invasive aliens" are oversimplistic and inflammatory. "Alien species do not come from Mars," the popular science magazine Discover reminds us; "they are not 'other.' They are very much of us, by us; we are the main agent of their spread." Seeds migrate via birds and the wind [[and nation defined borders change]], so "native" is not a static state.He goes on to talk about how GM giants Monsanto benefit from the destruction of so-called invasive plant species (in effect controlling diversity), while individual seed savers trying to continue their family's generations old heritage foods are stopped at borders. Concerned environmentalists have picked up the invasive=bad, local=good lingo. It's similar to industry like slaughterhouses benefiting from the labor of underpaid undocumented workers, while blue collar workers wonder if they can't get jobs because of the flow of immigrants. The either/or language is deceiving us.
I'm inspired to revisit Xicana writer Gloria Anzaldua's Borderlands/La Frontera, which embraces crossover.