Does Preen Kill Grass?

In the world of gardening, keeping weeds at bay is a common challenge. To address this issue, gardeners often turn to various products, and one such product that’s gained popularity is Preen weed preventer. But what about the lawn? Many gardeners wonder, “Does Preen kill grass”? In this article, we’ll explore the intriguing intersection of Preen weed preventer and your lush, green lawn. Understanding the potential impact of Preen on your grass is vital for maintaining a healthy and vibrant lawn.

What is Preen Weed Preventer?

Preen weed preventer is a well-known and widely used product in the gardening world. It is designed to help gardeners combat weeds in flower beds and other landscaped areas. The primary goal of Preen is to inhibit weed growth by creating a barrier that prevents weed seeds from germinating. This can be a significant time-saver for gardeners, reducing the need for constant weeding and cultivating a neater garden.

However, it’s crucial to understand that Preen is not intended for use on lawns. It’s formulated and recommended specifically for garden beds and areas where ornamental plants are grown. Preen works effectively in these scenarios by targeting weed seeds while leaving established plants unharmed. Now, let’s explore the potential impact of Preen on your grass in the next section.

Proper Application and Safety Measures

To ensure the safe and effective use of Preen weed preventer, it’s essential to follow these proper application and safety measures:

  1. Read the Label: Always read the product label carefully. The label provides specific instructions on where and how Preen should be used. Pay close attention to the recommended application rates and targeted areas.
  2. Apply in Garden Beds: Use Preen exclusively in garden beds and landscaped areas where ornamental plants are grown. Avoid using it on your lawn, as it’s not formulated for this purpose.
  3. Measure Correctly: When applying Preen, measure accurately to avoid over-application. Using more than the recommended amount can increase the risk of accidental contact with grass.
  4. Prevent Overspray: Take precautions to prevent overspray or wind drift onto your lawn. When applying Preen near the edge of your garden, use a shield or barrier to keep it from reaching your grass.
  5. Water In: After applying Preen, water the product into the soil or mulch to activate it. This helps prevent surface contact with your grass.
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By adhering to these guidelines, you can use Preen weed preventer as intended in garden beds while reducing the risk of unintended impact on your grass.

What to Do If Grass is Affected

If, despite your best efforts, you suspect that Preen has affected your grass, here are the steps to take:

  1. Stop Using Preen: Discontinue the use of Preen in areas close to your grass to prevent further damage.
  2. Remove Affected Grass: If a section of your lawn shows signs of damage, consider removing the affected grass and reseeding the area.
  3. Monitor and Repair: Keep an eye on the affected areas and implement lawn repair strategies as needed, such as overseeding, fertilizing, and watering.


In conclusion, Preen weed preventer, when used correctly, should not kill grass in your lawn. However, understanding its intended use and following proper application and safety measures are crucial for preserving the health of your grass. Preen is a valuable tool for gardeners to combat weeds in garden beds and landscaped areas. When used as recommended, it can help maintain a tidy and weed-free garden while leaving your grass unharmed.

Ultimately, the key is to read and follow the product label and use Preen responsibly to enjoy a flourishing lawn and beautiful, weed-free garden beds. By applying Preen with care and respecting its purpose, you can strike a balance between a weed-free garden and a vibrant lawn.