Before applying a preemergence herbicide, which step is recommended?

Before applying a preemergence herbicide, which step is recommended?

• A. Remove trash, leaves and excess dead grass from the lawn.
• B. Mow the lawn as short as possible.
• C. Apply fertilizer first.
• D. Water the lawn deeply.

Answer: (A)

Cleaning the lawn before applying a preemergence herbicide is essential because these products form a protective barrier in the topsoil to prevent weed seeds from germinating. Debris such as trash, leaves, and excess dead grass can block uniform contact with the soil, create uneven coverage, and trap moisture, which can reduce the herbicide’s effectiveness. A clean, even surface allows the product to distribute properly and reach the soil where it needs to act. The other steps aren’t as helpful for this purpose: mowing very short isn’t required and can stress turf; applying fertilizer first can alter soil conditions and isn’t part of forming the barrier; and watering deeply before application isn’t part of the activation process and can interfere with the product’s placement. After application, follow label directions for activation, typically involving a light irrigation if required.

Cleaning the lawn before applying a preemergence herbicide is essential because these products form a protective barrier in the topsoil to prevent weed seeds from germinating. Debris such as trash, leaves, and excess dead grass can block uniform contact with the soil, create uneven coverage, and trap moisture, which can reduce the herbicide’s effectiveness. A clean, even surface allows the product to distribute properly and reach the soil where it needs to act. The other steps aren’t as helpful for this purpose: mowing very short isn’t required and can stress turf; applying fertilizer first can alter soil conditions and isn’t part of forming the barrier; and watering deeply before application isn’t part of the activation process and can interfere with the product’s placement. After application, follow label directions for activation, typically involving a light irrigation if required.