Good Life

This Common Lawn Product Could Be Hurting Your Grass Instead of Helping It

By José R. Mendoza Men's Journal

Updated June 25, 2026 10:47 PM

Weed and feed is a combination of weed killer and fertilizer that tackles two tasks at once, saving homeowners time and money. However, applying it at the wrong time can be counterproductive and can do more harm than good. Timing is everything; weed and feed works best when applied in the spring and fall. In this guide, you'll learn the ins and outs of weed and feed and when to use it. Spoiler: Experts recommend tackling one task at a time rather than trying to kill two birds with one stone.

What Is Weed and Feed?

Weed and feed is a single product that combines weed killer and fertilizer. One of the most appealing benefits of weed and feed is that you can manage weeds while you feed (fertilize) your lawn.

The downside? "Feeding grass and killing weeds don't always align perfectly," explains Gene Caballero, co-founder of GreenPal.

Most weed and feed products contain pre-emergent to prevent weed seeds from germinating and nitrogen to boost your lawn's growth. However, applying a weed and feed product can leave your grass roots too weak to thrive during the summer.

Types of Weed and Feed Products

There are two types of weed and feed products: pre-emergent and post-emergent.

Pre-Emergent Weed and Feed

This type is formulated to prevent weed seeds from germinating and overtaking your yard and is best used in the spring. To get the most out of this treatment, it's important to read what weeds the product is designed to eliminate and compare this list to the types of weeds you have on your property.

Post-Emergent Weed and Feed

When weeds are fully developed, a post-emergent weed and feed treatment works best. Applying it in the fall will help address perennial weeds and prevent them from taking over your yard the following spring. If you end up applying a post-emergent at the wrong time, you could end up hurting your grass. That's why you need to be very careful and follow the manufacturer's instructions.

Does Weed and Feed Actually Work?

The short answer is yes, but there's a caveat.

Caballero explains, "[Weed and feed] works when applied at the right time and matched to the lawn's grass type and the specific problem."

Before you even attempt to spray a weed killer, you need to know what you're dealing with. Not every product will check all the boxes.

Curtis Atkinson, founder and CEO at Sunline Landscapes, notes that while weed and feed products work, "they will be most effective when applied to minor weed patches that aren't fully established in your lawn."

Each expert and professional has their own take on weed and feed products, but all agree that timing is crucial and that these treatments don't always end up helping with managing weeds and getting grass to grow.

What Lawn Experts Don't Like About Weed and Feed Products

Here's the deal: Weed and feed products are made for homeowners. Lawn experts prefer to address one problem at a time. Here's why:

Weed control and grass feeding have different schedules and applying otherwise effective treatments at the wrong time can be counterproductive.
Pros prefer applying these treatments separately to ensure proper weed control and timely fertilization.

Atkinson explains that while "dual-purpose products like [weed and feed] are attractive, you're usually better off getting a product focused on solving one problem and not trying to do a bunch of different things."

When to Apply Weed and Feed

If you've decided to use weed and feed products to tackle your yard's weeds and supercharge your lawn's growth, here are steps you can take to improve your chances of success.

Do your research: First things first, you'll need to know what kind of weeds you have in your lawn and get a product that works for those specific species.

Keep an eye on weather conditions: Any weed and feed product should be applied when temperatures are between 65 and 85 degrees, no rain is expected in the next 24 hours, and wind is minimal.

Apply your treatment strategically: The best time to apply a pre-emergent weed and feed is in the early spring, before the seeds start to germinate. Your grass will get lush but won't develop strong roots. On the other hand, post-emergent weed and feed treatment is best applied in early fall and will help with perennial weeds, such as creeping Charlie.

Why You Shouldn't Apply Weed and Feed in Summer

Applying any weed and feed in the summer is not a great idea. Your grass will likely already be stressed by the heat and during high temperatures herbicides can become volatile, evaporate, and be less effective. At the same time, the fertilizer component could stress your lawn even more or burn it.

Common Weed and Feed Mistakes

As we have established, weed and feed can work if applied properly, at the right time. However, these are common mistakes that homeowners often make:

Applying too early: Pre-emergent treatments work best when the temperatures are between 55 and 70 degrees.

Applying too late: Once weeds have already popped out in your yard, a pre-emergent treatment is no longer an option. You are better off just waiting until the fall to treat them. Or you can act now, but the best option will be to remove them manually.

Applying before rain: The weather should be wind and rain-free for 24 hours so the treatment doesn't spread to other sections of your lawn and damage flowers and other plants.

Applying during heat waves: Heat stresses grass, so applying a treatment won't work well and can do more harm than good.

Treating new grass: Applying weed and feed can kill or damage your new lawn. Wait until it is well-established before using these types of products.

Applying the product too often: Weed and feed products shouldn't be used more than two times a year.

Skipping reading the label's instructions: This is perhaps the most common mistake people make and one you should avoid at all costs. Here's where you'll find all the information you need, including what weeds the product treats and details on when and how to apply it.

Alternatives to Weed and Feed

Weed and feed products are time-savers, but they are only effective to some degree. If you're looking for alternatives, here are some options that can help you manage weeds in your lawn.

Spot spraying weeds: Use a weed killer to address specific areas in your lawn rather than spraying your whole lawn.

Pre-emergent treatments: Tackling one task at a time is the most effective way to keep your lawn healthy. You treat weeds in one application and then feed it at the right time.

Overseeding thin areas: Weeds love unhealthy lawns. Address all those patchy and thin areas and build a thick, robust lawn. Keep your grass height to a nice 3 to 4 inches.

Organic Weed Treatments:

If you are not a fan of herbicides or fertilizers, here are some organic options to consider:

Commercial vinegar with over 20 percent acetic acid
Ornamental oil
Potassium salt
Corn glute

Frequently Asked Questions

Does weed and feed actually work?

Yes, but the timing for weeding and feeding your grass doesn't always align. Experts recommend addressing one task at a time when possible.

Can you apply weed and feed before rain?

Rain should not be in the forecast for 24 hours before you apply the weed and feed; otherwise, it could get washed out and spread to other plants you don't want to kill.

Can I apply weed and feed to a new lawn?

No, you should wait until it is fully developed and you have mowed it at least a few times. Applying weed and feed to a new lawn could damage it or even kill off your grass.

Is spring or fall better for weed and feed?

Fall will be the best time because that's when you normally feed grass. But applying a weed and feed in the spring will prevent weed seeds from becoming established.

How often should I apply weed and feed?

Weed and feed should not be applied more than two times a year.

This story was originally published by Men's Journal on Jun 26, 2026, where it first appeared in the Home Living section. Add Men's Journal as a Preferred Source by clicking here.

This story was originally published June 25, 2026 at 9:36 PM.