When is the Ideal Time to Water Your Lawn After Weed and Feed?

When is the Ideal Time to Water Your Lawn After Weed and Feed?

If you enjoy having a lush and healthy lawn, then using weed and feed is probably a part of your lawn care routine. Weed and feed is a combination product that helps with weed control and fertilization. The herbicides target different types of weeds, like dandelions and clover, while the fertilizer provides essential nutrients such as nitrogen, phosphorus, and potassium for healthy grass growth.

Weed and feed products are usually applied in granular form by using a spreader. However, the timing can vary depending on the specific product and regional climate. Regular use of weed and feed can help keep your lawn weed-free and healthy. But, it is essential to wait before watering your lawn after applying weed and feed. You should refrain from watering for at least 12 hours.

It is best to wait for 12 to 24 hours before watering your lawn after applying weed and feed. Waiting for 24 hours is optimal as it allows sufficient time for the weed-killing ingredients to attach to the weeds and for the fertilizer to penetrate the soil effectively. This waiting period ensures that the product isn’t washed away by immediate watering, maximizing its effectiveness in controlling weeds and promoting healthy grass growth.

Moreover, allowing 24 hours before watering minimizes the risk of nutrient runoff so that your lawn receives the full benefits of the applied weed and feed treatment.

How to water your lawn after weed and feed

Lawn sprinkler on lawn


After applying weed and feed to your lawn, proper watering is essential to maximize its effectiveness. Ensure that the product has been evenly distributed across the lawn. After waiting 12 to 24 hours, water your lawn thoroughly to activate the weed-killing ingredients and allow the fertilizer to penetrate the soil. Aim for deep watering rather than frequent shallow watering. Deep watering encourages the roots to grow deeper into the soil, making the grass more resilient to drought and stress. To achieve deep watering, water the lawn for a longer duration but less frequently, ensuring that the soil is moistened to a depth of at least 6 inches.

Consider using a sprinkler system or a hose with a sprinkler attachment to water the lawn evenly. This helps prevent a soggy lawn due to overwatering or drying out from underwatering, ensuring consistent coverage. Monitor the weather conditions and adjust your watering schedule accordingly. During periods of hot weather or drought, your lawn may require more frequent watering to prevent stress. Conversely, during cooler or rainy periods, reduce the watering frequency to avoid overwatering and potential runoff and nutrient leaching.

Finally, avoid watering during the hottest part of the day to minimize water loss through evaporation. Instead, aim to water your lawn in the early morning or late afternoon when temperatures are cooler, allowing the water to soak into the soil effectively.

Precautions for weed and feed

White dog jumping on lawn

Phototalk/Getty Images

While weed and feed products can be effective in controlling weeds and nourishing your lawn, there are cautions to consider to use them safely and efficiently. One major concern is the potential for overapplication, which can damage your lawn or surrounding vegetation. Carefully follow the manufacturer’s instructions regarding the proper application rates and techniques to avoid applying too much product.

Another caution to be aware of is the potential harm to non-target plants. Weed and feed products contain herbicides designed to kill broadleaf weeds, but they can also harm desirable plants if not applied carefully. Take care to avoid overspray onto flower beds, shrubs, or other ornamental plants, and consider using a targeted application method for precise weed control.

Always read and follow the safety precautions outlined on the product label, including wearing appropriate protective gear during application and keeping children and pets away from treated areas until the product has dried. By following these tips you can safely and appropriately apply your lawn care products for a vibrant, healthy lawn.

Dr Heidi Parkes

By Dr Heidi Parkes

Senior Information Extension Officer QLD Dept of Agriculture & Fisheries.