Left to our own devices, we'd probably just let weeds flourish and not force grass to grow where it doesn't want to. We use a simple manual lawn mower. To sum up, it's not so much a racial thing as it is generational and also based on how much you care what other people think when they drive by. We'd prefer people judge us by the content of the character we aspire to, rather than what we have or what our house looks like. As a white person, I believe lawn care is basic home maintenance.
Gardening is a hobby.
Lawn care is not. If one does not have a nice looking yard, it does not look good. I was in a black neighborhood. I assume it was black because the person I visited was black, plus the look of some of the houses and yards. Some houses looked run-down.