Why more fertilizer might actually kill your lawn

Society · Published 12 October 2026 Swipe more like this →

In short: It is tempting to assume that more nutrients equals a greener lawn, but excess fertilizer can be destructive. To achieve a healthy turf, you must master the relationship between NPK ratios, spreader settings, and application techniques to avoid the dreaded 'green stripes' or chemical burns.

Effective lawn care relies on understanding the NPK ratio found on every fertilizer bag. These three numbers represent nitrogen, phosphorus, and potassium—the essential elements for healthy turf. Nitrogen is often the most critical component. When selecting a product, note that high nitrogen numbers typically indicate chemical fertilizers that require smaller quantities, whereas low numbers suggest organic fertilizers that require much larger applications.

The application process is just as vital as the nutrients themselves. For the amateur, the most reliable method is to match the fertilizer bag's specific instructions to the settings on a spreader. While professionals use complex mathematical calculations involving nitrogen content and total lawn area, novices can avoid errors by using a spreader with matching numbers provided by the manufacturer. Two common types of spreaders are the drop spreader, which releases fertilizer straight down between wheels, and the broadcast spreader, which uses a rotating wheel to throw fertilizer over a wide area.

To ensure even coverage and prevent 'green stripes'—where some grass grows vigorously while other patches remain stunted—it is best to make two sets of passes perpendicular to each other. This technique prevents uneven distribution. Most importantly, never attempt to spread fertilizer by hand; this lack of precision often leads to over-application, which can burn or even kill the grass. Always follow the bag's directions, as more fertilizer is not better for the lawn.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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