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Sugar is good for plants, despite limiting nitrogen absorption. However, the sugar that is healthy for plants is typically the same sugar created by plants as part of photosynthesis. In other words, table sugar is not good or bad for plants on its own, just keep track of nitrogen levels in the soil. But don’t worry, sugar won’t kill your grass.

A spot herbicide for weed control is effective at killing crabgrass and not grass, but it depends on the type of herbicide. Always check the label to ensure that your herbicide is safe for grass but tough on crabgrass. Overall, spot treatment is ideal because it puts fewer herbicides into the soil, which can damage the soil. If you’re wanting a natural remedy to crabgrass that also won’t harm surrounding grass, you can also hand-remove crabgrass or even pour boiling water or 5% vinegar over crabgrass as a spot treatment.

How often you should fertilize your lawn depends on its health. A healthy, lush lawn with good soil health may only need fertilizing once per year. Other lawns with shallow roots or that have been neglected or overly reliant on fertilizers may need an application as often as every six weeks.

Putting too much lime on your lawn can change the soil's pH level from acidic to alkaline. While grass doesn't do well in acidic soils, an alkaline situation can be just as detrimental to its health. Alkaline soil blocks the grass's ability to absorb vital nutrients necessary for survival. If you apply too much lime, you can reverse the effects over a relatively short time by applying commercially available products designed for the purpose or by adding compost to the soil.