Green lawn says a lot about the occupants of the house.
If the grass is always short and the lawn is well maintained, it says the occupants love their property and their house is probably in good shape too.
If the grass is long, looks disheveled and junk everywhere, then obviously, the house is a mess too.
So long as there are no structural problems with the house, by keeping a well manicured green lawn, your property should keep its value.
There is nothing like a green lawn. Though you may have one naturally, you may find that some years you have to work to keep it as green as you would like it to be.
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