Fences, Architectural Details, Lawn ornaments, Painting.
These are all structural cues to the care of the adjacent landscape. Where a fence is well-maintained, or especially freshly painted, where nearby buildings are well maintained and painted, where lawn ornaments or architectural details like window boxes or shutters indicate human attention a place, the landscape nearby is more likely to appear to be well cared for. In the Midwest, the color white used to paint buildings and fences is particularly associated with care.