Does your beautiful St. Augustine lawn sometimes look more like a patchy mess than a lush green carpet? You are not alone! Keeping St. Augustine grass healthy means fighting back against pesky weeds. Finding the perfect “Weed and Feed” product can feel like a treasure hunt where all the maps are confusing. Many products promise miracles, but which one actually works best for your specific lawn problems?
Choosing the wrong product can lead to yellowing grass or worse—weeds that just keep coming back. You want strong, vibrant grass without harming your lawn. This guide cuts through the confusion. We will break down exactly what you need to look for in a St. Augustine Weed and Feed.
Keep reading to discover the secrets to a weed-free, thriving St. Augustine lawn. You will learn which ingredients matter most and how to apply them correctly for the best results. Get ready to transform your yard!
Top St Augustine Grass Weed And Feed Recommendations
- SOUTHERN LAWNS: Specially formulated for Southern lawns like Bermudagrass, St. Augustinegrass (including Floratam), and more, this grass fertilizer for lawn provides care and acts as a weed killer for lawns
- 6-MONTH PROTECTION: Delivers up to 6 months of weed prevention, stopping listed broadleaf and grassy weeds, including crabgrass
- WEED KILLER: Kills listed weeds like dandelion, dollarweed, and clover, serving as a reliable weed and feed for lawns to keep your lawn healthy and maintain its beauty
- LAWN FERTILIZER: This lawn fertilizer and weed control product feeds, greens, and strengthens your lawn, helping it remain lush throughout the season
- EASY APPLICATION: Use with a broadcast or drop spreader to apply this weed and feed lawn fertilizer, managing your lawn care routine with ease and maximum results
- This pre-emergent and post-emergent herbicide controls weeds and provides a 15-0-4 fertilizer mix.
- The fertilizer is designed for Centipede, Zoysia and St. Augustine lawns and grass types.
- Do not use this product on Bermuda Grasses or any other type of Northern grass.
- Apply the product in early spring for improved lawn health and weed defense throughout the season.
- Covers 5,000 square feet. Application varies by footage. See label for application instruction.
- Easy to spread granules and easy to handle
- 2 applications in the spring and fall
- Can be used on all types of St. Augustine grasses
- KILLS & PREVENTS WEEDS* UP TO 6 MONTHS: Kills broadleaf weeds*, including Dandelion, Clover, Chickweed and Henbit with a proven blend of weed killers *Listed
- CRABGRASS PREVENTION: Prevents grassy and listed broadleaf weeds such as Crabgrass, Annual Bluegrass, Common Dandelion, Goosegrass and Spurge for up to 6 months
- IDEAL FOR SOUTHERN LAWNS: Improve your lawn care with this broadleaf weed killer that treats up to 4,000 square feet of southern turf, including all varieties of St. Augustinegrass and Floratam
- READY FOR THE SEASON: With one application, this crabgrass preventer offers season-long weed control
- SIMPLE APPLICATION: Apply these weed killer granules with a rotary or drop spreader and water lightly 24 hours after applying
- Scotts Turf Builder WinterGuard Fall Weed & Feed3 is a weed killer and lawn fertilizer that controls weeds and feeds grass in the fall for a better lawn next spring
- Fall weed and feed kills over 50 listed lawn weeds, including clover, dandelion, plantain, morningglory, chicory, eveningprimrose, and purslane
- Apply weed control plus grass fertilizer to a moist lawn when weeds are actively growing and temperatures are consistently between 60°F and 90°F
- This lawn care product is for use on Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass
- One 11.43 lb. bag of Scotts Turf Builder WinterGuard Fall Weed & Feed3 covers 4,000 sq. ft.
- Lesco Professional, 50 LB, 13,00 SQFT, 17-0-17 St Augustine Turf Fertilizer
- 30% Poly Coated Sulfur Coated Urea, Specially For St. Augustine Grass
- Should Be Applied When Turf Is Wet, Allow To Dry & Total Results In 2 Weeks, Safe For Floratam Variety, Slow Release Providing Up To 8 Weeks Of Feeding
- Its very easy and elegant to use
- 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: Specially formulated for Southern lawns like Bermudagrass, St. Augustinegrass (including Floratam), and more, this grass fertilizer provides care and acts as a weed killer for lawns
- 6-MONTH PROTECTION: Delivers up to 6 months of weed prevention, stopping listed broadleaf and grassy weeds, including crabgrass
- WEED KILLER: Kills listed weeds like dandelion, dollarweed, and clover, serving as a reliable weed and feed for lawns to keep your lawn healthy and maintain its beauty
- LAWN FERTILIZER: This lawn fertilizer and weed control product feeds, greens, and strengthens your lawn, helping it remain lush throughout the season
- EASY APPLICATION: Use with a broadcast or drop spreader to apply this weed and feed lawn fertilizer, managing your lawn care routine with ease and maximum results
Choosing the Best St. Augustine Grass Weed and Feed: Your Buying Guide
St. Augustine grass is a popular choice for warm-season lawns. It gives you a thick, green carpet. But keeping it healthy means fighting weeds. A good St. Augustine Grass Weed and Feed product helps you do both at once. This guide helps you pick the right one for your yard.
Key Features to Look For
When shopping, check the label for these important features:
- **Weed Control Type:** Does it kill existing weeds (post-emergent) or stop new ones from sprouting (pre-emergent)? Many top products offer both.
- **Fertilizer NPK Ratio:** N-P-K stands for Nitrogen, Phosphorus, and Potassium. Nitrogen (N) keeps the grass green. Look for a ratio that favors Nitrogen for St. Augustine growth, like 15-0-15 or similar.
- **Application Method:** Is it a granular product you spread with a spreader, or a liquid you mix with water? Granular is often easier for large areas.
- **Temperature Guidance:** St. Augustine grass is sensitive. The product must match the time of year you plan to apply it.
Important Materials in Your Weed and Feed
The effectiveness of the product depends on its ingredients.
Active Weed Killers
You will often see common active ingredients listed. For broadleaf weeds (like dollarweed), look for ingredients like 2,4-D or Dicamba. For grassy weeds, Mesotrione is sometimes included, but be careful—St. Augustine grass can sometimes be sensitive to certain grassy weed killers. Always confirm the label says “Safe for St. Augustine.”
Nutrient Sources
The fertilizer part needs good nutrients. Slow-release nitrogen is a big plus. This means the nutrients feed your lawn over many weeks, not just one big burst. This prevents sudden growth spurts followed by yellowing.
Factors That Improve or Reduce Quality
The quality of your weed and feed changes based on what it contains and how you use it.
What Improves Quality?
- Micronutrients: Adding small amounts of iron or sulfur improves the deep green color without over-fertilizing.
- Water Solubility: For liquid feeds, how easily they mix with water ensures even coverage on the lawn.
- UV Protection: Some modern formulas include ingredients that help the fertilizer stay put and work longer, even under strong sun.
What Reduces Quality?
- High Salt Content: Fertilizers with too much salt can burn your grass, especially during hot, dry weather.
- Wrong Timing: Applying weed control when temperatures are too high (above 85°F) can seriously damage your St. Augustine lawn.
- Poor Spreader Calibration: If you dump too much product in one spot, the grass will turn brown or die there. Accuracy matters greatly.
User Experience and Use Cases
How easy is the product to use? This affects your overall experience.
Most users prefer granular products for ease of application using a standard broadcast spreader. Liquid concentrates are better if you have a small patch or need quick results, but mixing can sometimes be messy.
When Should You Use It?
- Early Spring: This is the perfect time for pre-emergent weed control before weeds start growing.
- Late Spring/Early Summer: This is the main feeding time when the grass is actively growing. Apply fertilizer when the lawn is actively growing, but avoid the hottest part of summer.
- Fall Feeding (Optional): A lighter feeding in the fall helps the grass store energy for the winter.
10 Frequently Asked Questions (FAQ) About St. Augustine Weed and Feed
Q: Is it safe to use Weed and Feed around pets and kids?
A: Yes, usually, but only after you water the product in and the lawn dries completely. Always read the re-entry interval (REI) on the bag before letting anyone walk on the treated area.
Q: Can I use this product if my St. Augustine lawn is stressed or dormant?
A: No. Never apply weed and feed to stressed, drought-stricken, or dormant grass. Wait until the lawn is actively greening up after a period of rain or irrigation.
Q: How long does it take to see results from the fertilizer?
A: You should see the grass greening up within 5 to 7 days. Weed death usually takes 10 to 14 days, depending on the weed type and temperature.
Q: What is the best temperature to apply St. Augustine Weed and Feed?
A: Aim for temperatures between 60°F and 80°F. Never apply when the forecast shows temperatures over 85°F, as this increases the risk of burning the lawn.
Q: Should I water before or after applying the product?
A: Generally, water lightly before application if the soil is dry. Then, water again lightly right after application to move the fertilizer and weed killer down to the soil level. Wait 24 hours before watering heavily again.
Q: Will this product kill my existing clover?
A: Most standard weed and feeds are designed for broadleaf weeds like clover and dandelions. Check the label to ensure clover is on the target list.
Q: How often should I apply St. Augustine Weed and Feed in a year?
A: Most lawn care experts suggest 3 to 4 applications per year, spaced about 8 to 10 weeks apart, following the seasonal feeding schedule.
Q: My grass turned yellow after applying. What happened?
A: Yellowing often means the lawn was burned. This happens from applying too much product (over-fertilizing) or applying it during high heat without enough water.
Q: Can I use a liquid Weed and Feed instead of granular?
A: Yes. Liquid feeds work faster, but they require very careful, even spraying. Granular products are often more forgiving for beginners.
Q: Does this product stop new weeds from growing?
A: If the product contains a pre-emergent ingredient (like prodiamine), it will stop seeds from sprouting. You must apply pre-emergents before the weeds germinate, usually in early spring.