Does your beautiful Southern lawn look more like a patchy weed patch? You spend hours mowing and watering, but stubborn invaders like dollarweed and crabgrass still take over. It’s frustrating! The intense heat and humidity of the South create the perfect breeding ground for weeds, making lawn care a constant battle.
Choosing the right weed killer adds another layer of stress. Should you use a pre-emergent or a post-emergent? Will it harm your St. Augustine or Bermuda grass? Finding a product that works effectively in our unique climate without damaging your turf feels like a guessing game.
Don’t worry! This guide cuts through the confusion. We will explore the best, most reliable weed killers specifically designed for the challenges of Southern lawns. You will learn exactly what to look for to finally achieve that lush, green carpet you dream about.
Ready to reclaim your yard? Let’s dive into the secrets of successful weed control for Southern homeowners.
Top Weed Killer For Southern Lawns Recommendations
- WHEN TO USE: Use this lawn weed killer sprayer to treat small, actively growing weeds when daytime temperatures are below 90°F (and are not expected to exceed 90°F for 6 hours)
- HOW TO USE: This 1 gal. container of Ortho WeedClear Weed Killer for Lawns Ready-to-Use1 comes with the continuous-spray Comfort Wand weed sprayer to easily spot treat weeds in your lawn
- KILLS LAWN WEEDS: Ortho WeedClear Lawn Weed Killer Ready-To-Use1 weed killer for lawns kills listed weeds including dandelion, dollarweed, chickweed, and clover without harming your lawn (when used as directed)
- FAST-ACTING WEED CONTROL: This broadleaf weed killer for lawns kills over 250 weeds (see label for complete list) and produces results in hours
- WHERE TO USE: Use this lawn weed control product to kill weeds in southern lawns including Bahiagrass, Bentgrass, Bermudagrass (hybrid and common), Buffalograss, Centipedegrass, Fescue, Kentucky Bluegrass, Zoysiagrass, and St. Augustinegrass (except Floratam)
- KILLS LISTED BROADLEAF WEEDS: Season Long Lawn Weed Killer + Preventer for Southern Lawns kills listed broadleaf weeds, including Dandelion, Clover, Chickweed, Dollarweed, and Henbit for up to 6 months
- PREVENTS WEEDS & CRABGRASS UP TO 6 MONTHS: Prevents listed grassy and broadleaf weeds, including Crabgrass, Annual Bluegrass, Common Dandelion, Goosegrass, and Spurge, for up to 6 months
- FOR SOUTHERN LAWNS: Treats up to 4,000 sq. ft. of southern turf, including all varieties of St. Augustinegrass, including Floratam; Also use on Bermudagrass, Centipedegrass, Zoysia, and more, as listed on the label
- SEASON-LONG WEED CONTROL: One application provides season-long control of over 50 listed lawn weeds; Apply these weed killer granules with a rotary or drop spreader and water lightly 24 hours after applying
- GET MORE FROM THE BLUE BOTTLE: From simple spot treatments to season-long protection, BioAdvanced science-based solutions make it simple to control unsightly weeds and protect against damaging diseases without harming the lawn, when used as directed
- For use on 9 turf types
- Controls a wide range of lawn weeds
- A patented combination of 3 proven weed killers
- Directions for use in conventional & hose end sprayers
- WEED KILLER SPRAY FOR LAWNS: With a simple hose-end application, kill weeds in your lawn, including dandelions, chickweed, clover, crabgrass and foxtail with Ortho WeedClear Lawn Weed Killer Ready-to-Spray
- FAST-ACTING WEED CONTROL: This weed killer hose sprayer kills listed weeds like crabgrass, dandelion, clover, chickweed and creeping charlie down to the root and gets results with 1 application
- COVERAGE: This 32 fl. oz. container of Ortho WeedClear Lawn Weed Killer Ready-to-Spray provides up to 5,000 sq. ft. of lawn care
- HOW TO USE: Apply to listed lawn weeds that are young and actively growing by connecting your garden hose to the weed killer sprayer, sliding the switch to "ON" and spraying evenly until the lawn is wet
- WHERE TO USE: This spray weed killer for lawns won't harm lawn grasses when used as directed - use on lawn grasses including Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass and Zoysiagrass
- HOW TO USE: To use this weed control product, connect your garden hose to the weed killer hose sprayer, turn on the water and spray evenly over the area where you want to kill weeds
- WHERE TO USE: This weed spray kills listed weeds not lawns, and may be used on well-established cool-season and warm-season turf grasses
- LAWN WEED CONTROL: This lawn weed killer also controls wild violet and dollarweed, and selectively controls other listed sedge and broadleaf weeds, including dandelion, purslane and spurge
- NUTSEDGE KILLER: Kill nutsedge (nutgrass), kyllinga and over 50 other tough weeds with Ortho Nutsedge Killer for Lawns Ready-To-Spray1
- COVERAGE: This 32 fl. oz. container of Ortho Nutsedge Killer for Lawns Ready-To-Spray1 covers 5,000 sq. ft.
- Kills the weeds not the lawn when used as directed
- Fast acting, see results in hours
- Safe on Floratam lawns
- Kills the toughest weeds-down to the root
- WEED KILLER FOR LAWNS: Ortho WeedClear Lawn Weed Killer Ready-To-Use1 weed killer spray refill, kills weeds including dandelions, dollarweed, chickweed, and clover without harming your lawn (when used as directed)
- HOW TO USE: Attach the battery-powered Ortho Comfort Wand weed killer sprayer from your previous bottle to your new Ortho WeedClear Lawn Weed Killer Ready-to-Use1 Refill bottle to spot treat with a continuous stream--no bending or pumping required
- FAST-ACTING WEED CONTROL: This herbicide weed killer kills over 250 weeds (see label for complete list) and produces results in hours
- WHERE TO USE: Use the weed spray on Southern lawns including Bahiagrass, Bentgrass, Bermudagrass (hybrid and common), Buffalograss, Centipedegrass, Fescue, Kentucky Bluegrass, Zoysiagrass and St Augustinegrass (except Floratam)
- WHEN TO USE: Apply this broadleaf weed killer for lawns to actively growing weeds when daytime temperatures are below 90°F (and are not expected to exceed 90°F for 6 hours)
Choosing the Best Weed Killer for Your Southern Lawn: A Buyer’s Guide
Southern lawns face tough challenges. Hot summers and humid weather help weeds grow fast. You need the right weed killer to keep your grass green and healthy. This guide helps you pick the best product for your yard.
Key Features to Look For
When buying weed killer, look closely at what the product does. Different sprays attack different weeds.
- **Selective vs. Non-Selective:** Selective killers target specific weeds (like broadleaf weeds) without harming your desirable grass (like Bermuda or Zoysia). Non-selective killers kill everything they touch, including your lawn. For general lawn care, choose **selective**.
- **Pre-Emergent vs. Post-Emergent:** Pre-emergent products stop weeds before they sprout from seeds. Post-emergent products kill weeds that are already growing. Many Southern homeowners use both for the best control.
- **Fast-Acting vs. Slow-Release:** Fast-acting products show results quickly, often within hours. Slow-release formulas offer longer protection over several weeks or months.
- **Safety Ratings:** Check if the product is safe for pets and children *after* it dries.
Important Materials and Ingredients
The active ingredients determine how well the weed killer works. You should know what you are spraying.
For **post-emergent** control, common active ingredients include:
- **2,4-D, MCPP, and Dicamba:** These are standard chemicals that effectively kill broadleaf weeds (like dandelions and clover).
- **Glyphosate:** This is the main ingredient in many non-selective killers. Use this only for clearing patches of weeds where you plan to reseed.
For **pre-emergent** control, look for:
- **Prodiamine or Pendimethalin:** These ingredients create a barrier in the soil, stopping weed seeds from germinating. Apply these early in the spring before temperatures rise too high.
Factors That Improve or Reduce Quality
The quality of your weed killer depends on how well it works with your specific lawn type and the Southern climate.
**Factors that improve quality:**
- **Temperature Specificity:** High-quality Southern formulas work well even when temperatures are above 85°F. Some generic killers break down too fast in extreme heat.
- **Rainfastness:** A good product sticks to the weeds quickly. Look for a formula that is rainfast (weatherproof) within one to two hours. This prevents rain from washing the product away before it works.
- **Concentrate vs. Ready-to-Use:** Concentrates often offer better value and allow you to customize the strength, improving control.
**Factors that reduce quality:**
- **Poor Adhesion:** If the spray beads up and rolls off the waxy leaves of weeds, it will not work well.
- **Using the Wrong Type:** Applying a product meant for cool-season grass onto St. Augustinegrass can severely damage your lawn. Always check the label for grass compatibility.
User Experience and Use Cases
How you use the product greatly affects your success. Southern lawns need timely application.
**User Experience Tips:**
- **Timing is Everything:** For pre-emergents, apply them when soil temperatures are consistently around 55°F. For post-emergents, weeds are easiest to kill when they are actively growing, usually mid-morning when dew has dried.
- **Calibration:** If you use a hose-end sprayer or a pump sprayer, make sure you apply the correct amount. Too little will not kill the weeds; too much can burn your grass.
- **Spot Treating vs. Broadcast:** For a few scattered weeds, spot treating saves money and reduces chemical use. For a full infestation, broadcast spraying the entire lawn is necessary.
10 Frequently Asked Questions (FAQ) About Southern Weed Killers
Q: Which weeds are the biggest problem in Southern lawns?
A: The biggest problems are usually broadleaf weeds like dollarweed and clover, and grassy weeds like crabgrass, especially during the hot summer months.
Q: When should I apply pre-emergent weed killer in the South?
A: You should apply pre-emergent herbicide just before the soil warms up enough for weed seeds to sprout. This is usually late February or early March, depending on your specific location in the South.
Q: Can I use a weed killer made for Northern lawns on my Bermuda grass?
A: You must check the label. Many Northern formulas contain ingredients that stress or kill warm-season grasses like Bermuda, Zoysia, or St. Augustinegrass.
Q: How long must I wait after spraying before letting my dog back on the lawn?
A: This varies by product. Most modern selective weed killers are safe once the spray has completely dried, usually within one to four hours. Always read the label’s re-entry instructions.
Q: What makes a weed killer “rainfast”?
A: A rainfast product sticks to the weed leaves quickly. This means if it rains a short time after you spray, the chemical won’t wash off into the soil or run down the street.
Q: Does liquid or granular weed killer work better in the heat?
A: Liquid formulas often provide better immediate contact and absorption, which can be slightly better when temperatures are high. However, granular products are easier to spread evenly.
Q: Will one application kill all my weeds?
A: No. Most tough Southern weeds need repeat applications, especially if you have a bad infestation. You usually need to wait two to three weeks between post-emergent treatments.
Q: Should I water my lawn before or after spraying?
A: For post-emergent killers, apply when the grass is dry, usually mid-morning. Do not water for at least 24 hours afterward so the chemical has time to work.
Q: What if my lawn has both broadleaf weeds and grassy weeds?
A: You might need two different products. Use a broadleaf killer for the clover and a separate product (or a combination product specifically labeled for both) to handle crabgrass.
Q: Can I use weed killer when it is 95 degrees outside?
A: It is risky. Extreme heat can cause the weed killer to be absorbed too quickly, burning your grass, or it can cause the product to volatilize (turn into a gas) and drift onto sensitive plants nearby.