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Natives vs. non-natives, long-term


I'm puzzled by the fact that I don't think I've ever seen, say, 
little or big bluestem along a roadside here in southeastern
Wisconsin.

In recent years, I have seen them as far out as a half-mile
from purposeful prairie plantings, so the seed will spread!
But I don't think I've ever spotted them in a place where
I subsequently don't find a nearby preserve.

Are the non-native grasses introduced 100 or 150 years ago 
so strong that they out-competed and eliminated such natives 
in every instance, in every nook and cranny I pass?

What does this say about today's plantings - are they forever 
doomed to be "hot house flowers" that can't stand up to the 
others in the long term?

- John

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