From my personal experience, whites are more likely to show pride in home ownership, and do general maintenance much better and more frequently. This certainty does not apply to all whites, I’ve been through my fair share of run down, dirty with trash everywhere mobile home parks that are mostly white. It’s more of a poor vs. not poor thing.
The blacks I’ve seen in decent middle class neighborhoods almost always have nicely tended homes. Mexicans are universally the worst, they don’t maintain the house or the property, despite many of them working in landscaping and construction. They do not take care of their own lawns at all. That’s most likely a cultural thing, I doubt much lawncare is done in Mexico at all considering much of northern Mexico is desert.
A black guy lives right next door to me. He keeps the place up very nice. But he is only the caretaker for the rich white guy who owns the place.