But I know they have regulations about height of weeds and lawns. I received a warning about the height of some weeds along a fence in the alley one year, but they have never said anything about the ornamental grass elsewhere in the yard that grows over five feet tall.

You've probably run across most of this in your "idea stage" for converting to natives, but in all the available info from the DNR there must be a key to local regs or at least as to what is generally considered acceptable on one's own property.

We had a few hotly contested incidents when I lived in Maryland. And it was decided that there was a big difference between simply letting a yard revert to unkempt weeds and gardening with native plants.

I posted to your question about nurseries and was then going to send you an email to see if you wanted to arrange a trade. Since you don't have an email address here I couldn't if you care to make a trade email me.

I have a half acre yard in the western 'burbs and it's all garden, no turfgrass. I worked with my city to insure I had no problems, even though one sourpuss neighbor tried to give me some grief over it. Oh, I fully informed the neighbors too and took into account the impact of my plantings on their yards (unlike the idiots that planted a willow where it will eventually shade out the only place I have for a vegetable bed).