I respectfully disagree/ agree that the idea of mowing perennials seems like a valid practice in either zone. Now, how to mow at 4-6 inches - will need a whole different mower?
I read some of these wildflower meadow help threads and can only use general gardening knowledge to suggest. May or may not be the best advice, but I'm trying
I think if I was trying to convert to a meadow, I would be planting the perennials and using heavy mulch to control the annual weeds, Later maybe try drifts of select annuals in limited areas I can tend. I think the annuals could self sow later on top of the mulch as it breaks down. Of course, you could have blown in weeds and breakthroguh from below then too.
My library installed perennials including mountain mint a very spreading one. The tiny starts were planted with lots of mulch. They've filled in well in 2-3 years.
Sorry about the failed seed, how disappointing and expensive!