When To Apply Phosphorus Fertilizer To Your Lawn

Smart soils What you can do to reduce phosphorus Gardening in Michigan
Smart soils What you can do to reduce phosphorus Gardening in Michigan

When to Apply Phosphorus Fertilizer to Your Lawn

An Overview of Phosphorus Fertilizer

Phosphorus is an essential nutrient for a healthy, lush lawn. But too much of it can be dangerous to the environment and can kill your lawn. It’s important to understand when to apply phosphorus fertilizer so you can keep your lawn healthy without worrying about over-fertilizing.

When to Apply Phosphorus Fertilizer

In general, phosphorus fertilizer should only be applied when there is a deficiency. A soil test is the best way to determine if there is a phosphorus deficiency and how much fertilizer should be applied. If a soil test is not available, you should wait until the spring to apply phosphorus fertilizer.

How Much Fertilizer to Apply

The amount of phosphorus fertilizer to be applied depends on the type of grass you have, the soil conditions, and the results of the soil test. As a general rule, you should use half the amount of phosphorus fertilizer recommended on the product label.

Best Application Practices

When applying phosphorus fertilizer, it’s important to use the right type of fertilizer and apply it properly. Choose a fertilizer that is specifically designed for lawns and contains at least 10% phosphorus. When applying the fertilizer, spread it evenly over the lawn and water it in thoroughly.

Tips for Applying Phosphorus Fertilizer

To ensure the best results when applying phosphorus fertilizer, here are a few tips to keep in mind:

  • Apply the fertilizer in the spring or early summer, when the plants are actively growing.
  • Follow the directions on the fertilizer label carefully.
  • Water the lawn after applying the fertilizer to help it soak in.
  • Do not apply phosphorus fertilizer if your soil test shows that the soil already has an adequate level of phosphorus.


Phosphorus is essential for a healthy, lush lawn. Applying the right amount of phosphorus fertilizer at the right time is important for maintaining a healthy lawn. Follow the tips above and use a soil test to determine when and how much fertilizer to apply.

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