A lush, green lawn requires proper care, and using weed and feed is an essential step in maintaining its health. Weed and feed product combine herbicides to eliminate unwanted weeds and fertilizers to nourish grass, promoting thick, vibrant growth. However, for these products to be effective, proper timing and application methods are crucial. Applying weed and feed at the right time – typically in early spring or fall – ensures that weeds are actively growing and susceptible to treatment, while the grass receives essential nutrients for strong root development. Using the correct spreader and following recommended application rates also maximize effectiveness while minimizing potential harm to the lawn and environment. Additionally, safety considerations, such as keeping pets and children off treated areas until it is safe, are important. This guide will walk you through when to apply weed and feed, how to do it correctly, and key safety precautions to ensure a healthy, thriving lawn.
What is Weed and Feed and How Does It Work?
Weed and feed products contain two key components: a weed killer and a fertilizer, both designed to improve lawn health. The weed killer targets common lawn invaders such as broadleaf weeds (dandelions, clover, and chickweed) and, in some formulations, crabgrass. These herbicides work by either preventing weed seeds from germinating (pre-emergent) or kill existing weeds by disrupting their growth (post-emergent). The second main component, fertilizer, provides essential nutrients – primarily nitrogen – to promote thick, green grass. Nitrogen encourages healthy blade growth, phosphorus supports root development, and potassium strengthens the grass against drought and disease. Together, these components ensure that while weeds are eliminated, the grass receives the nourishment it needs to thrive. Some formulations also include slow-release fertilizers for long-term feeding. Choosing the right weed and feed product based on your lawn’s specific needs helps maintain a vibrant, weed-free yard while ensuring your grass remains strong and resilient throughout the growing season.
How Does Weed and Feed Control Weeds?
Weed and feed products use either pre-emergent or post-emergent herbicides to target weeds at different stages. Pre-emergent weed control prevents weed seeds from germinating, making it ideal for stopping crabgrass and other annual weeds before they appear. These product are best applied in early spring or fall. Post-emergent weed control, on the other hand, kill existing weeds by disrupting their growth, targeting broadleaf weeds like dandelions and clover. Some weed and feed formulas contain selective herbicides, which only affect weeds, while other use non-selective herbicides that can harm grass if not applied correctly. Choosing the right type ensures effective weed management.
When to Apply Weed and Feed for the Best Results
Applying weed and feed at the right time of year is crucial for effective weed control and lawn nourishment. The two best times to apply it are in early spring and fall, depending on your lawn’s needs and the types of weeds your targeting.
Early spring is an ideal time to use weed and feed, especially if it contains a pre-emergent herbicide. This helps prevent weed seeds, like crabgrass, from germinating before they take root. It also provides an early nutrient boost to the grass as it begins to grow actively after winter dormancy. For best results, apply when soil temperatures reach around 55°F and before weeds become established.
Fall is another effective time for application particularly for targeting perennial broadleaf weeds such as dandelions and clover. A post-emergent weed and feed can kill these weeds while the fertilizer strengthens the grass for the winter months. Fall application also helps lawns recover from summer stress and prepare for vigorous growth in the spring.
Weather conditions play a significant role in the effectiveness of weed and feed. Avoid applying it during extreme heat or drought, as the grass may be stressed, and the chemical could cause further damage. Heavy rain can wash away the product before it has a chance to work, reducing its effectiveness. Similarly, applying it just before rain can lead to runoff, potentially harming nearby plants or waterways. For optimal absorption, apply weed and feed when the lawn is slightly damage, such as after a light watering or morning dew, but avoid overly wet conditions.
By timing your application correctly and considering weather conditions, you can maximize the benefits of weed and feed, ensuring a healthy, weed-free lawn throughout the growing season.
When is It Too Late to Spray for Weeds?
Applying weed and feed in late summer is often ineffective because most weeds have already matured, making them harder to control, and high temperatures can stress the grass. By this time, many weeds have developed deep roots or even gone to seed, meaning post-emergent herbicides may not work as well. Additionally, fertilizers in weed and feed products may not be as beneficial during late summer heat, as grass growth naturally slows in preparation for fall.
Signs that it’s too late to apply weed and feed include fully mature weeds that have flowered or produced seeds, prolonged drought conditions that leave grass dry and brittle, and daytime temperatures consistently above 85°F. If weeds have already spread significantly, spot-treating them or waiting until fall for a targeted post-emergent application is often more effective. Timing is key to ensuring weed and feed works properly, so applying it too late may lead to wasted product and minimal results.
Preparing Your Lawn for a Weed and Feed Application
Mowing before applying weed and feed improves its effectiveness by ensuring better contact with weeds and allowing fertilizer to reach the soil more efficiently. Cutting the grass reduces the height of weeds, exposing fresh growth that can better absorb herbicides. It also prevents tall grass from blocking granules or liquid applications, ensuring even distribution. However, it’s important not to mow too short, as this can stress the lawn. Additionally, after mowing, wait a day before applying weed and feed to allow weeds to recover and actively absorb the treatment. Proper mowing ensures maximum absorption and better overall lawn health. Save yourself a step and get an instant mowing quote with LawnGuru!
Watering Before and After Application
Soil moisture plays a crucial role in activating weed and feed, ensuring both the herbicide and fertilizer work effectively. Applying it to slightly damp soil helps the granules to stick to weeds and begin absorption, while also allowing nutrients to penetrate the soil. Watering the lawn a day before application ensure adequate moisture without making the ground too wet. After applying, wait 24 to 48 hours before watering again to allow the herbicide time to work. Then, light watering helps activate the fertilizer and carry nutrients into the soil. Proper moisture management enhances weed control and promotes healthy grass growth.
Keep Children and Pets Safe
After application of weed and feed, it’s best to keep kids and pets away from the lawn for at least 24 to 48 hours. This allows the herbicide to fully absorb and dry, reducing exposure risks. Always check the product label for specific safety guidelines, and water the lawn before resuming activity.
How to Apply Weed and Feed to Your Lawn
Granular and liquid weed and feed products differ in application method, absorption rate, and effectiveness based on lawn conditions. Granular weed and feed is applied using a spreader and works best when the lawn is slightly damp, as the granules stick to weeds before being watered in. It’s ideal for slow, consistent feeding. Liquid weed and feed, applied with a hose or sprayer, absorbs more quickly and is better for targeting active weed growth. Homeowners should choose granular for overall lawn maintenance and gradual nourishment, while liquid is better for quick weed control in smaller areas or severe infestation.
Using a Spreader for Granular Application
Using a broadcast spreader for granular products ensures even distribution across the lawn, promoting consistent results. To apply, first, adjust the spreader settings according to the product label. Fill the hopper on a hard surface to prevent spills, then walk at a steady pace while pushing the spreader, overlapping slightly with each pass to avoid gaps. A broadcast spreader disperses granular in a wide, even pattern, preventing over-application in some areas and under-application in others. After spreading, lightly water the lawn to activate the product. Proper use of a broadcast spreader enhances effectiveness and promotes a healthy lawn.
Properly Applying Liquid Weed and Feed
Using a sprayer for liquid weed and feed ensures precise application and quick absorption. First, mix the product according to label instructions, ensuring the correct concentration. If using a hose-end sprayer, attach it securely and adjust the nozzle for even spraying. For pump or backpack sprayers, maintain consistent pressure while spraying in a sweeping motion. Apply evenly, covering the lawn without over-saturating. Avoid spraying on windy days to prevent drift onto unintended areas. After application, allow the lawn to dry completely before watering or allowing foot traffic. Proper spraying techniques ensures effective weed control and balanced lawn nutrition.
Common Mistakes to Avoid When Using Weed and Feed
Applying weed and feed correctly is essential for maintaining a healthy lawn, but common mistakes can reduce its effectiveness or even harm your grass. One major mistake is using too much product, which can lead to excess nitrogen buildup. Over-fertilization can cause rapid, weak growth, increase the risk of disease, and even burn the grass, resulting in brown patches. Always follow the recommended application rates to avoid damage.
Another mistake is applying weed and feed on newly seeded lawns. The herbicides in these products can prevent grass seed from germinating or stunt young grass growth. If you’ve recently planted grass seed, wait until the new grass has been mowed at least three times before applying weed and feed to ensure it’s strong enough to handle the treatment.
Timing is also crucial. Applying weed and feed at the wrong time – such as during extreme heat, drought, or right before heavy rain – can make it ineffective or harmful. Heat and drought stress can weaken the grass, while rain can wash away the product before it has a chance to work.
Finally, improper watering can reduce effectiveness. Watering too soon after application can rinse away herbicides before they act on weeds, while failing to water granular products after the waiting period can prevent the fertilizer from reaching the soil. To get the best results, apply the product under the right conditions, use the correct amount, and follow proper watering guidelines to ensure a strong, healthy lawn.
Maintaining a Healthy Lawn After Using Weed and Feed
Maintaining a healthy lawn after applying weed and feed requires proper care, including watering, mowing, and reapplication at the right intervals. In the weeks following application, water deeply but infrequently – about 1 to 1.5 inches per week – to encourage strong root growth. Avoid overwatering, an excessive moisture can wash away nutrients and reduce effectiveness. Early spring lawn care is essential for lawn health after using the product, view our tips for a healthy lawn here.
Mow regularly but avoid cutting more than one-third of the grass height at a time to prevent stress. Keeping the lawn at the recommended height helps shade out weeds and promotes thicker, healthier grass. If necessary, reapplying weed and feed according to the product’s instructions, typically once in early spring and again in fall. Avoid overuse, as too much herbicide can damage the lawn.
For homeowners seeking organic lawn care alternatives, consider using natural fertilizers like compost or seaweed-based products. Corn gluten meal can serve as an organic pre-emergent herbicide, helping prevent weed growth while providing nitrogen. Aerating and overseeding in fall can also improve lawn health, naturally crowding out weeds. By following these maintenance steps, choosing the right care approach, and additional research on weed and feed, you can keep your lawn green, healthy, and weed-free throughout the growing season.
FAQ About Weed and Feed for Lawns
How soon can I mow after applying weed and feed?
Wait at least 48 hours before mowing after applying weed and feed. This allows the herbicide to be absorbed by the weeds for maximum effectiveness. Mowing too soon can reduce weed control and disrupt the even distribution of the fertilizer.
How long should I wait before letting kids or pets on the lawn?
Keeps kids and pets off the lawn for at least 24 to 48 hours after applying weed and feed. This allows the product to fully absorb and dry. Watering the lawn after this period can help further minimize any potential exposure risks.
Can I apply weed and feed before planting grass seed?
Avoid applying weed and feed before planting grass seed, as the herbicides can prevent seed germination. If using a pre-emergent formula, wait at least 6 to 8 weeks before seeding. For best results, plant grass first, let it establish, then apply weed and feed later.
What’s the best time of day to apply weed and feed?
The best time of day to apply weed and feed is in the early morning or late afternoon when temperatures are cooler. Avoid midday heat, as it can cause evaporation or lawn stress. Morning dew can also help granular products adhere to weeds for better absorption.
