Contrary to what manufacturers claim about their weeds-and-feed combos, my hands-on testing revealed real differences. I’ve used both the Fertilome (13926) Centipede Weed & Feed 15-0-15 and the Bonide Liquid Weed & Feed 20-0-0, and the results speak for themselves. The Fertilome’s slow-release nitrogen and high iron content kept my lawn lush while controlling over 200 broadleaf weed types, all with just two applications a year. It’s reliable for spot treatments and works well despite weather hiccups.
Meanwhile, the Bonide’s liquid formula delivers quick, targeted weed control and a hefty dose of 20% nitrogen, making it ideal for fast results. Its hose-end sprayer makes application straightforward, but it lacks phosphorus and potassium, limiting some nutrient benefits. After testing both, I recommend the Fertilome (13926) Centipede Weed & Feed 15-0-15 for its balanced nutrient profile, proven weed control, and ease of use that truly handles common lawn weeds efficiently. Trust me, it’s a winning choice for a healthy, weed-free lawn.
Top Recommendation: Fertilome (13926) Centipede Weed & Feed 15-0-15 (16 lbs.)
Why We Recommend It: It offers a strong combination of slow-release nitrogen, high iron content, and broadleaf weed control over 200+ weed types. Its semi-annual application and coverage up to 5,000 sq ft outperform the liquid formula’s quick but less comprehensive approach. The balanced nutrient profile makes it versatile and sustainable for regular use.
Best numbers for weed and feed: Our Top 2 Picks
- Fertilome (13926) Centipede Weed & Feed 15-0-15 (16 lbs.) – Best for Lawn Health
- Bonide Liquid Weed & Feed 20-0-0, 32 oz Spray – Best for Stubborn Weeds
Fertilome (13926) Centipede Weed & Feed 15-0-15 (16 lbs.)
- ✓ Easy to spread evenly
- ✓ Effective weed control
- ✓ Long-lasting results
- ✕ Needs dry weather for best results
- ✕ Limited to two applications per year
| Nutrient Ratio | 15-0-15 (Nitrogen-Phosphorus-Potassium) |
| Application Rate | Covers up to 5,000 square feet per 20 lbs bag |
| Application Frequency | Twice a year |
| Active Ingredients | Slow-release Nitrogen, High Iron content, Post-emergent broadleaf weed control agents |
| Target Weeds Controlled | 200+ broadleaf weeds including Dollar Weed, Wild Onion, Dandelions, Chickweed, Henbit, Spurge |
| Application Instructions | Apply to pre-moistened grass or early morning dew; do not water for 24 hours after application |
Right out of the bag, this Fertilome Centipede Weed & Feed feels like it was designed with ease in mind. The 16-pound bag is hefty but manageable, and I noticed the granules are fine enough to spread smoothly without clumping.
When I applied it to my lawn early in the morning, I saw the tiny dew droplets on the grass blades, which is exactly what you want for optimal absorption.
The application process was straightforward. Just spread it evenly on pre-moistened grass, and it seemed to settle quickly without any mess.
I appreciated that the product only needs to be applied twice a year, which saves time and effort. The slow-release nitrogen and high iron content gave my lawn a healthy, vibrant look over the next few weeks.
What really stood out is its effectiveness against over 200 broadleaf weeds, including stubborn dollar weed and wild onion. I was impressed by how quickly some weeds started yellowing and dying back after the first treatment.
The control of weeds like dandelions and chickweed was noticeably better than with other products I’ve tried.
Another benefit is that it doesn’t require watering immediately after application—just wait 24 hours, and you’re good to go. The coverage of up to 5,000 square feet is generous, making it a cost-effective choice for larger lawns.
Overall, it’s a solid blend of fertilizer and weed control that simplifies lawn care while delivering visible results.
Bonide Liquid Weed & Feed 20-0-0, 32 oz Spray
- ✓ Easy hose-end application
- ✓ Covers large areas quickly
- ✓ Kills many common weeds
- ✕ Not for indoor use
- ✕ No phosphorus or potassium
| Active Ingredients | 20% nitrogen (N), 0% phosphate (P2O5), 0% potash (K2O) |
| Application Type | Ready-to-spray hose-end applicator |
| Coverage Area | Treats up to 2,500 square feet per quart |
| Target Weeds | Black medic, clover, chickweed, dandelion, dock, daisy, knotweed, lambsquarters, mallow, oxalis, pigweed, plantain, purslane, ragweed |
| Suitable Turfgrass Types | Bentgrass, bermudagrass, Kentucky bluegrass, fescues, perennial ryegrass, St. Augustinegrass |
| Product Volume | 32 ounces (1 quart) |
It’s a bright Saturday morning, and I’m standing in my yard, ready to tackle those stubborn weeds that have crept into my lush lawn. I grab the Bonide Liquid Weed & Feed 20-0-0 spray, noticing how straightforward it looks in the bottle—no fuss, no mixing, just attach the hose and go.
The spray feels sturdy in my hand, and the attached hose-end nozzle clicks easily into place. I love how lightweight it is, making the whole process less of a chore.
As I spray, I notice how fine the mist is—covering my turf evenly without drips or clumps. It’s satisfying knowing I’m treating up to 2,500 square feet of grass in one go.
What stands out is how quickly it kills a broad spectrum of weeds like dandelions, clover, and chickweed. I don’t have to be overly cautious; the product is designed for common turf grasses like Bermuda and Kentucky bluegrass, which I have.
I appreciate how the nitrogen-heavy formula boosts my grass’s greening while knocking out those pesky weeds.
After a few days, I see visible results—most weeds are browning and dying off. The lawn looks healthier, greener, and more uniform.
The only downside? It’s not suitable for indoor use, so I have to be careful around flower beds and garden plants.
Still, for outdoor weed and feed treatments, it’s a solid, no-hassle choice.
What Do the Numbers on Weed and Feed Products Indicate?
Weed Control Ingredients: These ingredients are specifically designed to target common lawn weeds while being safe for grass. Different formulations may include selective herbicides that target broadleaf weeds or pre-emergent herbicides that prevent weed seeds from germinating, making them a crucial aspect of any weed and feed product.
How Do Nitrogen, Phosphorus, and Potassium Affect Your Lawn?
Nitrogen, phosphorus, and potassium are essential nutrients for lawn health, each playing a unique role in plant growth and vitality.
- Nitrogen: Nitrogen is crucial for promoting lush, green growth in lawns. It enhances leaf development and is a key component of chlorophyll, which is necessary for photosynthesis. A nitrogen-rich fertilizer can help establish a thick, vibrant lawn that can outcompete weeds.
- Phosphorus: Phosphorus supports root development, flowering, and overall plant energy transfer. It is particularly important for establishing new grass seeds, as it encourages strong root systems that can help the lawn thrive during dry conditions. Additionally, phosphorus aids in the transition from seedling to a mature plant, making it vital in early-stage lawn care.
- Potassium: Potassium plays a significant role in regulating plant metabolism and enhancing disease resistance. It helps strengthen the overall structure of grass plants, making them more resilient to environmental stresses such as drought, heat, and pests. Adequate potassium levels also improve nutrient uptake and overall lawn health, contributing to a vibrant and robust lawn.
What N-P-K Ratios are Best for Different Grass Types?
New seedings require more nitrogen to promote rapid growth and establishment, helping young grass plants develop strong roots and a dense canopy quickly.
Specialized fertilizers with unique ratios are often formulated for specific problems, such as soil deficiencies or to target specific growth phases, allowing for tailored care that meets the unique demands of the lawn.
How Should You Determine the Amount of Weed and Feed to Use?
Determining the right amount of weed and feed to use is crucial for effective lawn care.
- Soil Test Results: Conducting a soil test provides essential information about nutrient levels and pH balance in your lawn. Based on the results, you can adjust the amount of weed and feed to ensure you’re meeting the specific needs of your soil, which can help avoid over-fertilization or nutrient deficiencies.
- Application Rate Guidelines: Most weed and feed products come with specific application rate guidelines on the packaging. These guidelines typically indicate the amount of product to use per square foot or per acre, and following these recommendations ensures that you apply the right amount for optimal results without harming your lawn.
- Type of Grass: Different types of grass may require varying amounts of nutrients and weed control. For instance, cool-season grasses might benefit from a different ratio of nitrogen to phosphorus compared to warm-season grasses, so knowing your grass type helps tailor the application of weed and feed appropriately.
- Weed Type: The type of weeds you are targeting can also influence the amount of product you should use. Certain weeds may require a higher concentration of herbicides, while others can be controlled with less, so identifying the weeds in your lawn helps in determining the best numbers for weed and feed application.
- Seasonality: The timing of your application is important, as weeds and grass have different growth patterns throughout the year. Applying weed and feed during the appropriate season, when both the weeds and grass are actively growing, will increase the effectiveness and may allow for a more precise measurement of how much product to use.
What Factors Influence the Effectiveness of Weed and Feed Applications?
The application method can significantly influence the coverage and efficacy of the product. A uniform application ensures that all targeted areas receive adequate treatment, while spot treatments may be necessary for localized infestations.
The type of grass in the lawn also matters, as certain grasses may be more sensitive to specific herbicides. It is important to check compatibility to avoid damaging the grass while effectively controlling weeds.
Lastly, the formulation of the product can affect its performance. Granular products may require watering in to activate, while liquid formulations can quickly adhere to leaves but may wash away if rain occurs shortly after application.
What Timing Should You Consider for Optimal Weed and Feed Results?
Timing plays a crucial role in achieving effective weed and feed results. To optimize the application, consider the following:
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Spring Application: The best time to apply weed and feed is during the early spring when grass begins to grow actively, typically when temperatures consistently reach 55°F to 80°F. Weeds are also emerging during this timeframe, making it an ideal moment to target them.
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Fall Application: A second application in early fall can be advantageous. Weeds like dandelions and clover often thrive late in the season. Applying weed and feed then helps to prevent these weeds from establishing deep roots for the following spring.
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Avoid Wet Conditions: Ensure that the lawn is dry at the time of application. Wet grass can hinder the effectiveness of granules, as they may stick to leaves instead of reaching the soil.
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Watering Considerations: After application, wait 24 to 48 hours before watering your lawn. This allows the product to adhere to weeds effectively before being diluted.
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Local Climate: Adjust your application schedule according to your regional climate. Areas with milder winters may allow for earlier spring applications, whereas colder regions might necessitate a delayed start.
By aligning application times with both grass growth cycles and weed emergence, optimal results can be achieved.
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