The City of Ann Arbor provides stormwater tax credits if you make a nice rain garden. Include a mix of local wildflowers!
You can get local wildflowers from the Native Plant Nursery, appearing at the Farmer's Market.
Michigan law protects wildflowers growing on public lands, including road right-of-ways. Don't pick them there; let them be so others can enjoy them, and the plants can reproduce and make more flowers next year.
References
- Michigan Wildflowers, Carson City, MI HS, Charles Peirce. 359 varieties illustrated with photographs and Latin names.
- Landowner's Guide to Backyard Management, Michigan DNR
- Wildflower Association of Michigan