Is your beautiful St. Augustine lawn dotted with pesky weeds? You want that lush, green carpet, but those unwanted guests keep showing up. Choosing the right “Weed and Feed” product can feel like a jungle expedition. Many bags promise magic, but which one actually works best for your specific grass and those stubborn invaders?
It’s frustrating when you spend time and money on a product, only to see disappointing results. You worry about harming your sensitive St. Augustine grass while trying to zap the dandelions. Finding the perfect balance between weed control and feeding your lawn is the biggest hurdle.
This guide cuts through the confusion. We will break down exactly what you need to look for in a St. Augustine Weed and Feed. You will learn how to pick a product that keeps your lawn healthy and weed-free all season long. Get ready to transform your yard from patchy to perfect!
Top St Augustine Grass Weed And Feed Recommendations
- FOR SOUTHERN LAWNS: 3-In-1 Weed and Feed is specially formulated to target types of weeds found in Southern lawns, like Bermudagrass, St. Augustinegrass and more
- PREVENTS NEW WEEDS UP TO 6 MONTHS: One application prevents listed weeds for up to 6 months; Apply when temperatures are between 50 and 90 degrees and weeds are actively growing
- KILLS SOUTHERN WEEDS: Kills Dandelion, Dollarweed, Clover, and other listed broadleaf weeds
- FEEDS & GREENS: Fertilizer feeds and greens your lawn for up to 3 months to promote thicker, healthier turf; Apply granules with a broadcast or drop spreader for smooth, even coverage across established lawns
- 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, feed your lawn, and protect against damaging diseases without harming the lawn, when used as directed
- One quart treats 3,720 sq ft
- Controls Weeds in St. Augustine and Centipede Grasses
- Package Weight: 1.021 kilograms
- Package Dimensions: 5.842 L x 19.177 H x 12.954 W (centimeters)
- SOUTHERN LAWNS: Formulated to work on major southern lawn types – Bermudagrass, St Augustinegrass (including Floratam), Centipedegrass and Zoysiagrass
- 6-MONTH PROTECTION: Prevents broadleaf, grassy weeds, and crabgrass for up to 6 months
- WEED KILLER: Kills weeds including Dandelion, Dollarweed, and Clover
- LAWN FERTILIZER: Feeds, greens, and strengthens your lawn
- INSECT KILLER: Kills Fire Ants*, Armyworms, Cutworms, Mole Crickets, Chinch Bugs and more *Kills fire ants upon initial application only
- Up to 2X more powerful dandelion and clover control (vs. previous formula)
- Clears out dandelions and clover—satisfaction guaranteed
- Weedgrip Technology grips the weeds you see—and the ones you don't
- Scotts most powerful weed and feed
- Feeds to thicken lawns and crowd out weeds
- WEED AND FEED FOR LAWNS: Apply this combination weed killer for grass and lawn food to your wet lawn when weeds are actively growing and daytime temperatures are consistently between 60°F and 90°F; don't apply more than 2X per year
- WEED KILLER PLUS LAWN FOOD: Scotts Turf Builder Weed & Feed5 weed killer plus fertilizer for grass is a clover and dandelion killer for lawns that also feeds to thicken your lawn and crowd out future weeds
- DO NOT USE ON: Do not use this grass fertilizer for lawns plus yard weed killer on St. Augustinegrass (including Floratam), Dichondra, Lippia, Carpetgrass, and Bentgrass lawns
- USE ON LISTED GRASS TYPES: Apply this lawn care product to Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass
- WEED CONTROL FOR LAWNS: These Scotts weed killer plus lawn fertilizer granules control over 50 listed lawn weeds, including clover, dandelion, plantain, morningglory, chicory, eveningprimrose, and purslane
- DUAL-ACTION FORMULA: Spectracide Weed & Feed 20-0-0 kills weeds while feeding your lawn.
- KILLS MAJOR BROADLEAF WEEDS: Kills dandelion, chickweed, knotweed, plantain, clover, mallow, purslane and many other broadleaf weeds.
- FEEDS LAWN: Formulated with 20% nitrogen to feed your lawn.
- COVERAGE: One 32-oz bottle treats up to 7,500 square feet.
- CONVENIENT THREE PACK: Three pack features one nozzle and three bottles of product.
- SOUTHERN GRASS FERTILIZER: Scotts Turf Builder Southern Lawn Food is a pesticide-free lawn fertilizer specially formulated for Southern lawns
- WHEN TO APPLY: Apply this fertilizer for grass during the growing season in spring, summer, or fall; for fast results, lightly water in after application
- WHERE TO USE: This lawn care product is formulated for Southern grass types; people and pets can re-enter the lawn after application
- BUILDS STRONG ROOTS: The included Scotts All-in-One Particles in this lawn food for grass build strong, deep grass roots to protect against heat and drought
- COVERAGE: One 14.06 lb. bag of Scotts Turf Builder Southern Lawn Food covers 5,000 sq. ft.
- 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
Your Guide to Lush St. Augustine Lawns: Choosing the Right Weed and Feed
St. Augustine grass makes beautiful, thick lawns in warm climates. Keeping it green and weed-free takes the right product. A “weed and feed” combines fertilizer to boost growth and herbicides to kill unwanted weeds. This guide helps you pick the best one for your yard.
Key Features to Look For
When shopping for St. Augustine weed and feed, several features matter greatly for success.
- St. Augustine Safe Herbicide: This is the most important feature. Many common weed killers harm St. Augustine grass. Ensure the label clearly states it is safe for your grass type. Look for active ingredients like Atrazine or 2,4-D that are formulated correctly for St. Augustine.
- Slow-Release Fertilizer: Good products use slow-release nitrogen. This means the fertilizer feeds your lawn steadily over weeks, not just a few days. Slow release prevents sudden growth spurts and “burning” the grass.
- Weed Coverage: Check the label to see which weeds the product targets. Does it handle common lawn invaders like Dollarweed, Clover, or Crabgrass? Match the product to the weeds you see most often.
- Seasonality: Some weed and feeds work best in spring, while others are better for fall applications. Check the recommended application time.
Important Materials Inside
The ingredients determine what the product actually does for your lawn.
The fertilizer part usually involves the N-P-K ratio (Nitrogen, Phosphorus, Potassium). Nitrogen (N) is key for green color and growth. For established St. Augustine lawns, look for a higher first number (Nitrogen).
The herbicide ingredients do the killing. Always check the concentration. Stronger concentrations might work faster but increase the risk of grass damage if misapplied. Safe formulations use lower, targeted amounts.
Factors That Improve or Reduce Quality
Quality depends on how well the product balances feeding and killing without causing stress.
Factors that improve quality: Products with micronutrients like iron or magnesium often give a deeper green color. High-quality slow-release coatings on the fertilizer beads ensure even feeding. Good quality also means the granules spread evenly.
Factors that reduce quality: Products that use fast-release nitrogen can burn your lawn if the weather gets hot or if you apply too much. If the herbicide is too harsh, it will yellow or kill patches of your St. Augustine grass. Poor quality often shows up in clumping, making application patchy.
User Experience and Use Cases
How easy is the product to use? Most weed and feeds come in granular form, which you spread with a broadcast or drop spreader.
Ease of Use: Granular products require accurate spreading. Look for products that come in resealable bags to keep unused portions dry. Some users prefer liquid concentrates because they mix easily in a sprayer, offering precise control over application, though this requires more mixing time.
Use Cases: The primary use case is routine lawn maintenance during the growing season (spring through early fall). If you have a severe weed infestation, you might need a dedicated spot treatment before using a general weed and feed. If you are starting a new lawn, avoid weed and feed until the grass is well-established (usually after the first mowing season).
10 Frequently Asked Questions (FAQ) About St. Augustine Weed and Feed
Q: Can I use this product if it rains soon after I apply it?
A: Check the label! Most granular products need 24 hours without rain to work properly. Rain too soon washes the chemicals away before they can absorb into the weeds.
Q: When is the best time of year to apply St. Augustine weed and feed?
A: Generally, apply when the grass is actively growing, usually early spring after the last frost, and again in late spring or early summer. Do not apply when temperatures are consistently above 90°F, as this stresses the grass.
Q: Will this kill dollarweed in my St. Augustine lawn?
A: Many premium St. Augustine formulas target broadleaf weeds like dollarweed. Always confirm the active ingredients list dollarweed on the packaging.
Q: How soon after seeding can I use a weed and feed?
A: You should wait! St. Augustine grass spreads by runners, not seeds, but if you overseed bare spots, wait until the new patches are established, usually 4 to 6 weeks, before applying weed killer.
Q: What should I do if my lawn turns yellow after application?
A: Yellowing often means the grass was stressed or burned. This can happen from applying too much product or applying it during extreme heat. Water deeply to try and flush the chemicals through the soil, but be careful not to wash them completely away.
Q: Do I need to water the lawn after applying granular weed and feed?
A: Yes, most manufacturers recommend a light watering after application. This helps move the fertilizer down to the soil and activates the chemicals, but avoid heavy watering that causes runoff.
Q: Can I use this product on my flower beds?
A: Absolutely not. The herbicide is designed to kill weeds in the lawn and will harm or kill desirable flowers, shrubs, and trees if it drifts onto them.
Q: What is the difference between a pre-emergent and a post-emergent weed and feed?
A: Pre-emergent stops weeds from sprouting. Post-emergent kills weeds that are already visible. Many good products combine both types.
Q: How often should I fertilize my St. Augustine lawn?
A: Depending on the product, you usually apply weed and feed 2 to 4 times per growing season. Follow the product’s suggested schedule for best results.
Q: Is it safe for pets to walk on the lawn after treatment?
A: Keep pets and children off the lawn until the product has fully dried or watered in, usually for several hours. Read the specific label instructions for safety waiting times.