From someone who works closely with a grounds crew that takes care of about 300 acres, that yard is clean! Not a single dandelion or weed to be seen!
Oh yeah, the car looks nice too.
In my experience, masking and spray painting is the only way to get wheel covers looking nice. Even rattle can paint will look good since you're talking about small areas. Yes, it's a lot of work and a real PITA masking, but the outcome will always look 100% better.