Rating this negative for self sowing and invasive traits. It has taken hold along the shoulders of a local two lane highway, well away from any initial plantings. If you let the seed heads dry, the seeds can sprout and seedlings are very hard to pull. Beware of handling the dry seedheads, as the seeds are very sharp, and become stuck in your socks, fleece, and knit gloves. They poke you painfully, or you spend hours picking them out of the fabric.

I have clumps of it, for about 20 years. It does grow next to a maple tree making a nice flowing grass clump. I manage them by cutting off all seedheads before they dry and shed.
Editing 5 years after initial comment - I've gotten rid of this, who needs the chore of trimming seedheads? and I'm now seeing this thickly established along even more local roads.

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I have never found this cultivar to be beautiful and I don't know why it is grown at all. It self-sows like crazy and is aggressive in the garden by seed. It is not supposed to come true from seed. Fortunately, it is not nearly as popular as a few other cultivars and I don't see it very much. The grass blades are wider than the mother species and the form is not really mounding. The flower clusters are very thick and wide and turn blackish.

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Be cautious with this grass. It can self-sow aggressively in some areas. I've just planted it this year, so don't know how it will behave in my area.

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