Weed and feed spray is a liquid formulation combining a broadleaf herbicide with a fertilizer in a single application. It is designed to kill existing broadleaf weeds, such as dandelions and clover, while delivering essential nutrients like nitrogen to promote turf growth and greening. While the liquid spray offers a straightforward application process, its effectiveness relies heavily on proper timing and technique. Following precise steps ensures the herbicide is absorbed by the weeds and the fertilizer is utilized by the grass, leading to a healthier, more uniform lawn.
Timing and Lawn Preparation
Successful application requires treating the lawn when weeds are actively growing, typically during the spring and early fall. Applying the product when the air temperature is consistently between 60°F and 90°F maximizes the weed killer’s efficacy; temperatures outside this range can reduce absorption or damage the turf. Select a day with calm winds to prevent spray drift onto non-target plants. Also, ensure no rain is forecasted for at least 24 to 48 hours following the treatment, as this dry period is necessary for the chemicals to adhere to the weeds.
Preparation should begin a few days before application to optimize conditions for absorption. Mowing the lawn two days prior to spraying is recommended, allowing weeds to have fresh, exposed leaf surfaces to absorb the herbicide. The herbicide works best when applied to a slightly damp lawn, which helps the solution stick to the foliage. This dampness can be achieved by applying the spray in the early morning when dew is present or by lightly misting the lawn with water beforehand.
Applying the Spray Correctly
Applying the liquid spray requires careful attention to detail, starting with proper product preparation. For concentrated formulas, accurately follow the manufacturer’s instructions for diluting the product with water inside a tank sprayer. If using a pre-mixed product with a hose-end sprayer, ensure the dial is set to the correct application rate. Calibrating the sprayer correctly is important because applying too little product will be ineffective, while over-applying can cause chemical burn to the grass.
Maintain uniform coverage by using a consistent, measured walking pace and applying the spray in overlapping passes. The goal is to lightly coat the entire lawn surface without saturating any single area, which prevents runoff and ensures equal distribution of fertilizer and herbicide. Walking at a steady speed prevents accidental double-dosing, which can damage the grass due to excessive fertilizer salts. Be cautious around the perimeter of the lawn and near flower beds, vegetable gardens, or ornamental shrubs. The broadleaf herbicide will kill any non-grass plant it contacts, so direct the spray away from these areas and pavement.
Post-Application Instructions
Once the application is complete, the lawn needs a period of rest for the herbicide to take full effect. Wait a minimum of 24 to 48 hours after spraying before watering the lawn or expecting any rainfall. This rain-free period allows the herbicide to be fully absorbed through the weed leaves and translocated throughout the plant. Watering too soon will dilute the product and reduce its ability to eliminate target weeds.
Safety precautions must be observed immediately after treatment, particularly regarding foot traffic. Children and pets should be kept off the treated area until the spray has completely dried, which usually takes a few hours. This minimizes the risk of exposure to the wet chemicals. Also, postpone mowing the lawn for two to four days following the application, giving the herbicide time to move from the leaf surface into the weed’s root system for complete control.