Saw this a few months ago, and loved it.
Need to know what to ask for

Looks like a dry out Mischanthus sinensis.

Reminds me of pampas grass

reminds me of pampas grass too ....

If possible return to the plant ....lightly run a finger along a leaf blade ...if it cuts like a razor blade or feels abrasive its pampas grass

If there's a bloody fingerprint here, we'll all know it was Pampas grass.

I can see a frozen custard restaurant in the background - which hails from the Great White North - so I think it is safe to say that this plant is Miscanthus sinensis (Maiden Grass). That species also has foliage with skin-slicing properties if you are so unfortunately as to run it between your fingers, and it also has the propensity to seed itself in quite perniciously here in the Ohio River valley region.

Pampas Grass (Cortaderia selloana) is similar, but quite a bit bigger I think and certainly not a hardy species in Wisconsin.

I'm so happy to see this beautiful pampas grass growing in Wisconsin It gives me the go-ahead to add similar to my garden. I love the flowey look. It's absolutely stunning. Enjoy it