There over 300 plants native to Midwestern prairies. Tell us which ones you are condsidering and we can go from there. Otherwise, it's an entire book.

(But most prairie plants are not "invassive." If they were, they'd be all over the place by themselves. They aren't.)

The only meadow plant that I've found to be invasive is the perennial Maximilian Sunflower. Spreading by underground rhizomes (?), it forms dense jungles if left unchecked. I've had to use Roundup to control it, and also spend a lot of time pulling up stems in the spring.

Asclepias speciosa is extremely invasive in a garden bed. Roots as thick as your thumb in every direction. I'm in z3, if you lived here I would advise against growing it unless you lived on an acreage where you could give it plenty of room. I had to eradicate it from my garden it was such a thug (and a jolly time I had trying to do it).

Grows in large patches on the prairie here.

John - my experience is many native prairie plants are invasive in my city garden. Several others I've had to remove from my garden or work hard at containing - Oenothera caespitosa, Sphaeralcea coccinea, Glaux maritima, Rumex venosus, Solidago missouriensis, Artemisia ludoviciana .

I agree that certain plants can be invasive in smaller gardens. I haven't found milkweek to be too much of a problem (I'm tolerant of its wanderings because of Monarchs), but definitely sunflowers, black eyed susan and coneflowers. Also cupplant has been a problem. Big Blue Stem can also be aggressive in small plantings.

Jeanne