Can you use weed and feed on your lawn multiple times a year? Yes, you can, but it’s crucial to follow specific timing guidelines to avoid damaging your grass. Applying weed and feed too frequently or at the wrong times can harm your lawn, leading to yellowing, thinning, or even death of desirable grass species. This guide will help you establish a proper lawn care schedule for effective weed and feed application.
Image Source: www.canr.msu.edu
The Basics of Weed and Feed
Weed and feed products are popular because they combine two essential lawn care tasks into one application: fertilizing your lawn and controlling weeds. The fertilizer provides nutrients that promote healthy, dense grass growth, which in turn helps to crowd out weeds. The herbicide component targets and kills common lawn weeds.
Why Timing Matters
The effectiveness and safety of weed and feed products depend heavily on their application timing. Different herbicides and fertilizers have optimal application windows for specific grass types and weed life cycles. Applying them outside these windows can render them ineffective or, worse, harmful to your lawn.
Developing Your Lawn Care Schedule
A successful lawn care schedule is more than just grabbing a bag of weed and feed. It involves considering your grass type, local climate, and the specific weeds you are trying to combat.
Grass Type Considerations
- Cool-Season Grasses: (e.g., Kentucky Bluegrass, Fescue, Ryegrass) These grasses thrive in cooler temperatures, typically in the northern parts of the country. They are most actively growing in spring and fall.
- Warm-Season Grasses: (e.g., Bermuda, Zoysia, St. Augustine) These grasses prefer warmer temperatures and are most active during the summer months.
The best time to apply weed and feed will vary depending on which type of grass you have.
Local Climate and Weed Cycles
Your local climate dictates when weeds are actively growing and when your grass is best able to recover from any potential stress caused by the application.
- Spring: This is a prime time for weed and feed application, especially for crabgrass prevention. Many common lawn weeds begin to sprout and grow in the spring.
- Fall: Another excellent period for weed and feed, particularly for controlling perennial weeds that are storing energy in their roots for winter.
Identifying Your Weeds
Knowing what types of weeds you have is crucial. Some weeds are annuals (completing their life cycle in one year), while others are perennials (living for multiple years).
- Annual Weeds: Often best controlled with pre-emergent herbicide in early spring before they germinate.
- Perennial Weeds: May require multiple applications or a different type of herbicide applied at a specific growth stage.
When to Apply Weed and Feed: A Seasonal Approach
Understanding the seasonal needs of your lawn is key to determining how often to use weed and feed.
Spring Lawn Treatment
Spring is often considered the most critical time for a spring lawn treatment using weed and feed.
- Timing: Apply when the grass has started to green up and resume active growth, typically after the last frost. For crabgrass prevention, timing is paramount. You want to apply a pre-emergent herbicide before crabgrass seeds germinate. This usually occurs when soil temperatures consistently reach around 50-55°F (10-13°C).
- What to Look For: Actively growing grass is essential for the product to be absorbed by both the grass and the weeds. Avoid applying when rain is imminent, as it can wash the product away, or when temperatures are expected to exceed 85°F (29°C), which can stress your lawn.
- Fertilizing Frequency: A spring application provides the nutrients your lawn needs to recover from winter and prepare for the growing season.
Summer Lawn Maintenance
Summer lawn maintenance requires a cautious approach to weed and feed.
- Avoidance: It’s generally not recommended to apply traditional weed and feed products during the peak of summer heat. High temperatures, coupled with the chemicals in the product, can severely stress or even kill your grass, especially cool-season varieties.
- Alternative Solutions: If you have persistent weeds in the summer, consider targeted spot treatments with a specific weed killer instead of broadcasting a weed and feed product over the entire lawn. You can also focus on proper watering and mowing to keep your grass healthy and resilient.
- Fertilizing Frequency: If your grass is actively growing and healthy in the summer (more common with warm-season grasses), a light, slow-release fertilizer might be appropriate, but avoid combined weed and feed products.
Fall Lawn Feeding
Fall is the second most important season for fall lawn feeding and weed control.
- Timing: Apply when weeds are still actively growing, but before they are killed by frost. This is often in early to mid-fall, after the extreme heat of summer has subsided. This application helps control perennial weeds and allows your grass to store energy for winter.
- Benefits: Fall applications help the turfgrass prepare for winter dormancy and promote root development. It also helps to eliminate broadleaf weeds that are often most visible and vulnerable in the fall.
- Fertilizing Frequency: This application is crucial for building a strong root system that will support the lawn in the following spring.
Winter and Dormancy
Weed and feed applications are not recommended when the grass is dormant or during the winter months. The product will not be effective, and it could potentially damage the lawn when it tries to emerge from dormancy.
How Often To Use Weed and Feed: Balancing Efficacy and Safety
The question of “how often” is best answered by understanding the optimal windows for application rather than a fixed number of times per year.
General Guidelines for Application Frequency
- Spring: One application is typically sufficient for crabgrass prevention and initial weed control.
- Fall: One application in the fall is beneficial for controlling perennial weeds and strengthening the lawn.
This means that for many lawns, two applications of weed and feed per year – one in spring and one in fall – are generally appropriate.
When Not to Apply Weed and Feed
- Drought Conditions: Never apply when the lawn is dry and stressed.
- Extreme Heat: Avoid application when temperatures are expected to exceed 85°F (29°C).
- Newly Seeded or Sodded Lawns: Wait until the new grass has been mowed at least 2-3 times before applying any weed and feed products.
- When Grass is Wet: Apply to dry grass and water lightly a day or two later, if no rain is expected, to help activate the product.
- Before Heavy Rain: If heavy rain is forecast within 24-48 hours of planned application, postpone it.
Specific Weed Control Strategies with Weed and Feed
Weed and feed products are formulated to target specific types of weeds.
Crabgrass Prevention
- Pre-emergent Herbicides: Many weed and feed products contain pre-emergent herbicide to prevent crabgrass seeds from germinating. The crabgrass prevention window in the spring is critical.
- Timing is Key: Applying too early means the herbicide can break down before the weeds sprout. Applying too late means the crabgrass may have already germinated, making the product less effective.
Broadleaf Weed Control
- Post-emergent Herbicides: Most weed and feed products also contain post-emergent herbicides that kill weeds that have already sprouted. These are effective against common broadleaf weeds like dandelions, clover, and plantain.
- Best Timing for Broadleaf Weeds: These weeds are typically most susceptible in the spring and fall when they are actively growing.
Advanced Lawn Care Techniques and Weed and Feed
Integrating weed and feed into a broader lawn care schedule can yield excellent results.
Overseeding Timing
Overseeding timing is crucial for a lush lawn.
- When to Overseed: The best time to overseed is typically in the fall for cool-season grasses, allowing the new seed to establish in cooler temperatures and benefit from fall rains.
- Weed and Feed Interaction: Avoid applying weed and feed products for at least 30 days before or after overseeding. The herbicides in weed and feed can kill the new grass seedlings.
Dormant Seeding
Dormant seeding involves sowing grass seed in late fall or early winter after the ground has begun to freeze but before it is completely frozen. The seeds lie dormant until spring.
- Weed and Feed Considerations: Do not apply weed and feed products on a lawn where you plan to do dormant seeding, as the herbicide will kill the seeds.
Product Selection and Application Tips
Choosing the right product and applying it correctly is as important as the timing.
Reading the Label
- Crucial Information: Always read and follow the product label instructions carefully. Labels provide specific information on application rates, timing, grass types, and safety precautions.
- Active Ingredients: Understand the active ingredients in the weed and feed product. Some products are formulated for specific grass types or target particular weeds.
Application Equipment
- Spreader Settings: Use a calibrated spreader (broadcast or drop spreader) to ensure even application. Incorrect spreader settings can lead to over-application (burning the lawn) or under-application (poor weed control).
- Calibration: Calibrate your spreader before each use to ensure you are applying the correct rate.
Environmental Considerations
- Watering: Water your lawn lightly a day or two after application (if no rain is expected) to help activate the fertilizer and herbicide. However, avoid watering heavily immediately after application, as this can wash the product off.
- Wind: Avoid applying on windy days to prevent drift onto desirable plants, flower beds, or neighboring properties.
Common Pitfalls to Avoid
Knowing what not to do is just as important as knowing what to do.
Over-Application
- Damage: Applying weed and feed too often or at too high a rate can burn your lawn, causing yellow or brown patches. It can also lead to the buildup of chemicals in the soil.
- Fertilizing Frequency: Stick to recommended fertilizing frequency based on the product and your lawn’s needs.
Applying to Stressed Lawns
- Heat Stress: Lawns under heat or drought stress are more susceptible to damage from herbicides. Wait until the grass has recovered.
- Winter Dormancy: As mentioned, applying to dormant grass is ineffective and potentially harmful.
Mowing Practices
- Before and After: Avoid mowing for a few days before and after applying weed and feed. This allows the weed killer to be absorbed by the weed leaves.
Tables for Clarity
To help you visualize your lawn care schedule, here are some helpful tables.
Table 1: General Weed and Feed Application Calendar (Cool-Season Grasses)
| Season | Timing | Primary Goals | Notes |
|---|---|---|---|
| Spring | Early to Mid-Spring | Crabgrass prevention, broadleaf weed control | Apply when grass greens up and after last frost. Soil temp 50-55°F for pre-emergent. |
| Summer | Avoid Application | Focus on watering and mowing | High temperatures can stress the lawn. |
| Fall | Early to Mid-Fall | Broadleaf weed control, lawn strengthening | Apply when weeds are actively growing. |
| Winter | Avoid Application | Lawn is dormant | No benefit, potential harm. |
Table 2: General Weed and Feed Application Calendar (Warm-Season Grasses)
| Season | Timing | Primary Goals | Notes |
|---|---|---|---|
| Spring | Late Spring to Early Summer | Crabgrass prevention, broadleaf weed control | Apply when grass has fully greened up and is actively growing. |
| Summer | Mid-Summer (if needed) | Spot treatment for weeds, light feeding (optional) | Use caution, avoid high heat. |
| Fall | Early to Mid-Fall | Broadleaf weed control, lawn strengthening | Apply before the first frost. |
| Winter | Avoid Application | Lawn is dormant | No benefit, potential harm. |
Frequently Asked Questions (FAQ)
Q1: How often can I realistically use weed and feed?
For most lawns, applying weed and feed twice a year – once in the spring and once in the fall – is generally sufficient and safe, provided you follow the product’s specific timing recommendations for your grass type and local climate.
Q2: Can I use weed and feed after fertilizing?
It’s best not to fertilize immediately after using a weed and feed product, and vice-versa. The combined nutrients and chemicals can sometimes overwhelm the grass. Consult the product labels for recommended waiting periods between applications of different lawn treatments.
Q3: What if it rains right after I apply weed and feed?
If light rain occurs a day or two after application, it can actually help activate the product. However, heavy rain immediately after application can wash away the chemicals, reducing effectiveness and potentially causing environmental runoff. If heavy rain is forecast, it’s best to postpone application.
Q4: Can I use weed and feed on a new lawn?
No, it is generally not recommended to use weed and feed products on newly seeded or sodded lawns. Wait until the new grass has been mowed at least two to three times. The herbicides in weed and feed can damage or kill young, establishing grass.
Q5: My lawn is green, but it’s very hot. Should I use weed and feed?
It’s advisable to avoid applying weed and feed products when temperatures are consistently above 85°F (29°C). The heat can stress your lawn, and the herbicides can exacerbate this stress, potentially leading to damage. Focus on proper watering and mowing during hot periods.
Q6: What is the difference between pre-emergent and post-emergent herbicides in weed and feed?
- Pre-emergent herbicides are designed to prevent weed seeds from germinating. They are most effective when applied in early spring before weeds like crabgrass sprout.
- Post-emergent herbicides are designed to kill weeds that have already emerged and are actively growing. They target existing weeds.
Q7: How do I know if my grass is cool-season or warm-season?
Cool-season grasses (like Kentucky Bluegrass, Fescue, Ryegrass) thrive in cooler climates and remain green year-round in many areas. They actively grow in spring and fall. Warm-season grasses (like Bermuda, Zoysia, St. Augustine) prefer warmer climates and go dormant (turn brown) in cooler months. They are most actively growing during the summer.
By adhering to these guidelines and developing a thoughtful lawn care schedule, you can effectively manage weeds and keep your lawn healthy and vibrant throughout the seasons.