no-mow grass for boulevard?
Thank you for writing.
There are two ways to look at this question.
First you can consider low mow grasses. Generally dwarf fescues are considered as the best of these. See later slides in this set. http://www.arboretum.umn.edu/UserFiles/File/2015%20Earth%20Day/Low%20maintenance%20lawns,%20arboretum%20final-sam%20bauer.pdf https://turf.umn.edu/news/which-fine-fescue-should-you-use
The second approach is to go to non-grass alternative groundcovers. There are many possibilities here depending on your preferences. Most are low maintenance and very dense. http://statebystategardening.com/state.php/mn/print/glorious_ground_covers/http://statebystategardening.com/state.php/mn/print/glorious_ground_covers/
A third approach is to go for bee lawns, that attract pollinators. https://www.beelab.umn.edu/wild-bees/wild-bees-flowers/beelawn This include mints, spearments, creeping thyme and many others.
I hope this helps