The Ultimate Guide to Weed & Feed: Timing, Techniques, and Tips

Weed & Feed Fertilizers: How and When to Use Them

Expert Lawn Care Advice from the Russo Lawn Care Specialists

Keeping your lawn green, thick, and weed‑free doesn’t have to be complicated—but timing and technique matter. Weed & feed fertilizers are a popular option for homeowners looking to tackle fertilization and weed control in a single step. When used correctly, they can be a convenient and effective part of your lawn care program.

At Russo, we help customers choose the right products and apply them at the right time. Here’s what you need to know about how weed & feed works, when to use it, and when to consider other options.

What Is Weed & Feed?

Weed & feed products combine:

• Fertilizer to promote healthy turf growth
• Selective herbicide designed to control broadleaf weeds like dandelions, clover, and plantain

Most weed & feed products are granular. Each granule contains fertilizer coated with herbicide that adheres to weed leaves when applied properly.

Important: Weed & feed controls existing weeds—it does not prevent new weeds from germinating.

How Does Weed & Feed Fertilizers Work?

Unlike spray herbicides, weed & feed products rely on leaf contact. This means:

• Weeds must be actively growing
• Weed leaves must be exposed
• Granules need moisture (dew or light watering) to stick to leaves

Once absorbed, the herbicide kills the weed while the fertilizer feeds surrounding grass, helping it grow thicker and naturally crowd out future weeds.

When Do I Use Weed & Feed?

Spring (After Green‑Up)

Spring is the most common—and effective—time to apply weed & feed, especially for cool‑season lawns.

Ideal spring conditions:

• Grass is actively growing
• Broadleaf weeds are visible and young
• Daytime temperatures are consistently above 55°F
• Lawn is slightly damp from morning dew

A spring application helps clean up weeds that survived the winter while giving your lawn a nutritional boost.

Fall (Excellent for Weed Control)

Fall is often overlooked, but it’s one of the best times for weed control.

Why fall works well:

• Weeds are storing energy in their roots
• Herbicide moves deeper into the plant
• Fewer weeds return the following spring
• Fertilizer supports root growth and turf recovery

Many professionals prefer fall broadleaf control over spring.

Lawns with Light to Moderate Weeds

Weed & feed works best as a maintenance tool, not a rescue solution.

It’s ideal if:

• Weeds are scattered rather than dominant
• Turf coverage is fairly dense
• You’re maintaining a healthy lawn—not fixing a heavily infested one

When You Should NOT Use Weed & Feed

During Summer Heat

High temperatures can stress turf and reduce herbicide effectiveness. Applying weed & feed during hot weather increases the risk of lawn damage.

Summer weed control is better handled with targeted spot treatments.

On Newly Seeded or Newly Sodded Lawns

Most weed & feed products:

• Prevent seed germination
• Can damage young grass plants

Wait until new grass has been mowed at least two to three times before applying weed & feed.

For Crabgrass or Other Annual Grasses

Weed & feed does not work as a pre‑emergent.

If your goal is crabgrass prevention:

• Apply a pre‑emergent herbicide early in spring
• Fertilize separately as needed

Trying to control crabgrass with weed & feed is a common and costly mistake.

Heavy Weed Infestations

If weeds cover a significant portion of your lawn:

• A dedicated herbicide application is more effective
• Fertilizer can be applied later at the appropriate time
• You’ll often get better results using fewer chemicals overall

Best Practices for Applying Weed & Feed

Apply to a Damp Lawn
Morning dew works perfectly. Moisture helps granules stick to weed leaves.

Don’t Mow Too Soon
Avoid mowing:

• 1–2 days before application
• 1–2 days after application

Follow Label Rates Exactly
More product does not mean better control—it increases the risk of turf injury.

Match the Product to Your Grass Type
Not all weed & feed products are safe for every turf species. When in doubt, ask an expert.

Weed & Feed vs. Separate Applications

Sometimes convenience wins—but not always. Here’s a simple comparison:

• Weed & Feed: Best for spring or fall maintenance with light weed pressure
• Separate Herbicide + Fertilizer: Better timing precision and control, especially for difficult weeds or summer conditions

Grow with the Pros: Trust the Russo Lawn Care Experts

Choosing the right lawn products—and using them at the right time—makes all the difference. Whether you’re managing a small residential lawn or multiple properties, the lawn care specialist at Russo are here to help you:

• Select the correct weed & feed product
• Understand your application window
• Build a seasonal lawn care plan that works

Stop by your local Russo location or talk with our lawn and turf experts—we’re here to help you get the most out of your lawn, season after season!