--- description: St. Augustine grass (Stenotaphrum secundatum) is a warm-season turfgrass commonly used in lawns, golf courses, and coastal landscapes due to its thick growth, shade tolerance, and ability to thrive in warm climates. However, maintaining a St. Augustine lawn can be challenging when broadleaf weeds invade, requiring selective herbicides like 2,4-D (2,4-Dichlorophenoxyacetic acid). But will 2,4-D kill title: Will 2,4-D Kill St. Augustine Grass? - POMAIS Agriculture image: https://www.pomais.com/wp-content/uploads/2025/03/24-D-550gL-Florasulam-7.4gL-SE.webp --- [Skip to content](#content) 16+ years professional one-stop agricultural plant protection solution provider [](https://www.pomais.com/) [Inquiry](#awb-oc%5F%5F10593) Will 2,4-D Kill St. Augustine Grass? Last Updated: December 26th, 2025656 words3.3 min read # Will 2,4-D Kill St. Augustine Grass? [Table Of Contents](#4895eb4733c7ddd9f) **St. Augustine grass (Stenotaphrum secundatum)** is a **warm-season turfgrass** commonly used in **lawns, golf courses, and coastal landscapes** due to its **thick growth, shade tolerance, and ability to thrive in warm climates**. However, maintaining a St. Augustine lawn can be challenging when **broadleaf weeds invade**, requiring selective herbicides like **2,4-D (2,4-Dichlorophenoxyacetic acid)**. **But will 2,4-D kill St. Augustine grass?** The answer depends on **the concentration, application rate, and grass health**. This guide will explain **how 2,4-D interacts with St. Augustine grass**, when it is safe to use, and **best practices for effective weed control without damaging your lawn**. ## **Does 2,4-D Kill St. Augustine Grass?** ### **How 2,4-D Affects St. Augustine Grass** ✔ **2,4-D is a selective herbicide**, primarily targeting **broadleaf weeds**, meaning it is **not designed to kill grasses** like St. Augustine. ✔ **In low concentrations**, St. Augustine grass **can tolerate 2,4-D**. ✖ **High concentrations can damage or kill St. Augustine grass**, causing **yellowing, stunted growth, or even turf dieback**. ✖ **Stress factors** such as **heat, drought, or over-application** increase the risk of grass injury. ### **When Can 2,4-D Kill or Harm St. Augustine Grass?** * **Young or Newly Established Lawns** – **Immature St. Augustine grass** is **more sensitive** to herbicides. * **High Application Rates** – Using a **strong concentration** or **reapplying too frequently** can cause **burning or thinning**. * **Extreme Heat Conditions** – Applying 2,4-D when temperatures exceed **85°F (29°C)** increases the risk of **grass injury**. * **Weakened or Stressed Grass** – If St. Augustine is **drought-stressed, over-fertilized, or suffering from disease**, it is **more vulnerable** to herbicide damage. ## **How to Use 2,4-D on St. Augustine Grass Without Killing It** ### **Choosing the Right 2,4-D Product** * **Use a 2,4-D formulation labeled as safe for St. Augustine grass**. Some broadleaf weed killers **contain other herbicides (Dicamba, MCPP, MSMA)** that can be **harmful to St. Augustine lawns**. * Avoid **high-concentration herbicide mixes** that **combine 2,4-D with other powerful herbicides**. ### **Safe Application Guidelines** ✔ **Apply during active growth** (spring or early summer) when grass is **not under stress**. ✔ **Use a low concentration** – A **diluted 2,4-D solution (0.5-1% mix)** is generally safe for St. Augustine grass. ✔ **Spot-treat weeds instead of broadcast spraying** – This minimizes exposure to healthy turf. ✔ **Avoid spraying in hot weather** – Apply when temperatures are **below 85°F (29°C)** to prevent **herbicide stress**. ✔ **Water the lawn 24 hours before application** to **reduce stress and improve tolerance**. ✔ **Reapply only if necessary** – If weeds persist, wait **at least 2-4 weeks** before making a second application. ## **What Are Safer Alternatives to 2,4-D for St. Augustine Grass?** If you are concerned about **herbicide damage**, consider **safer broadleaf weed killers** specifically designed for **St. Augustine grass**: ### **Selective Herbicides Safe for St. Augustine Lawns** ✔ **[Atrazine](https://www.pomais.com/product/atrazine/)** – Kills **broadleaf weeds** and some grassy weeds **while being safe for St. Augustine**. ✔ **[Metsulfuron-methyl](https://www.pomais.com/product/metsulfuron-methyl-60wdg/)** – Effective against **broadleaf weeds and sedges**, with **low impact on St. Augustine**. ✔ **Celsius WG Herbicide** – A highly effective **broadleaf weed and sedge control** solution that is **safe for St. Augustine**. ✔ **Simazine** – A pre-emergent herbicide **preventing weeds from germinating** while being **gentle on St. Augustine**. ## **Best Practices for Weed Control in St. Augustine Lawns** ✔ **Mow at the Proper Height** – Keeping St. Augustine grass at **3.5 to 4 inches** shades out weeds and **reduces herbicide need**. ✔ **Fertilize Properly** – A well-fed lawn is **more competitive against weeds**. Avoid excessive nitrogen, which can **weaken the grass**. ✔ **Improve Drainage and Soil Health** – Healthy turf with **good soil aeration** is **more resistant to weed competition**. ✔ **Use Pre-Emergent Herbicides** – Apply **pre-emergents in early spring** to **stop weeds before they appear**. ## **Final Verdict: Will 2,4-D Kill St. Augustine Grass?** * **2,4-D will not directly kill healthy, mature St. Augustine grass**, but **high concentrations or repeated applications can cause significant damage**. * **Young, stressed, or heat-exposed St. Augustine lawns** are **more susceptible to injury** from 2,4-D. * **For safer broadleaf weed control**, consider **Atrazine, or Metsulfuron** instead. * **Applying 2,4-D correctly**—at the right dilution, temperature, and conditions—**reduces the risk of harming your lawn**. By following **best practices** and using **selective herbicides wisely**, you can **effectively manage weeds** while keeping **your St. Augustine lawn healthy and green**. 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The answer depends on the concentration, application rate, and grass health.","name":"Will 2,4-D Kill St. Augustine Grass? - POMAIS Agriculture","@id":"https://www.pomais.com/faq-items/will-24-d-kill-st-augustine-grass/#richSnippet","isPartOf":{"@id":"https://www.pomais.com/faq-items/will-24-d-kill-st-augustine-grass/#webpage"},"image":{"@id":"https://www.pomais.com/wp-content/uploads/2025/03/24-D-550gL-Florasulam-7.4gL-SE.webp"},"inLanguage":"en-US","mainEntityOfPage":{"@id":"https://www.pomais.com/faq-items/will-24-d-kill-st-augustine-grass/#webpage"}}]} {"@context":"https:\/\/schema.org","@type":["FAQPage"],"mainEntity":[{"@type":"Question","name":"Will 2,4-D Kill St. Augustine Grass?","acceptedAnswer":{"@type":"Answer","text":"[fusion_builder_container type=\"flex\" hundred_percent=\"yes\" equal_height_columns=\"no\" hide_on_mobile=\"small-visibility,medium-visibility,large-visibility\" background_position=\"center center\" background_repeat=\"no-repeat\" fade=\"no\" background_parallax=\"none\" parallax_speed=\"0.3\" video_aspect_ratio=\"16:9\" video_loop=\"yes\" video_mute=\"yes\" border_style=\"solid\" link_color=\"var(--awb-color5)\"][fusion_builder_row][fusion_builder_column type=\"1_1\" type=\"1_1\" layout=\"1_1\" background_position=\"left top\" border_style=\"solid\" border_position=\"all\" spacing=\"yes\" background_repeat=\"no-repeat\" animation_speed=\"0.3\" animation_direction=\"left\" hide_on_mobile=\"small-visibility,medium-visibility,large-visibility\" center_content=\"no\" last=\"true\" hover_type=\"none\" background_blend_mode=\"overlay\" first=\"true\" min_height=\"\" link=\"\"][fusion_text]St. Augustine grass (Stenotaphrum secundatum)<\/strong> is a warm-season turfgrass<\/strong> commonly used in lawns, golf courses, and coastal landscapes<\/strong> due to its thick growth, shade tolerance, and ability to thrive in warm climates<\/strong>. However, maintaining a St. Augustine lawn can be challenging when broadleaf weeds invade<\/strong>, requiring selective herbicides like 2,4-D (2,4-Dichlorophenoxyacetic acid)<\/strong>.<\/p>\r\n

But will 2,4-D kill St. Augustine grass?<\/strong> The answer depends on the concentration, application rate, and grass health<\/strong>. This guide will explain how 2,4-D interacts with St. Augustine grass<\/strong>, when it is safe to use, and best practices for effective weed control without damaging your lawn<\/strong>.<\/p>\r\n

Does 2,4-D Kill St. Augustine Grass?<\/strong><\/h2>\r\n

How 2,4-D Affects St. Augustine Grass<\/strong><\/h3>\r\n

\u2714 2,4-D is a selective herbicide<\/strong>, primarily targeting broadleaf weeds<\/strong>, meaning it is not designed to kill grasses<\/strong> like St. Augustine.
\r\n\u2714 In low concentrations<\/strong>, St. Augustine grass can tolerate 2,4-D<\/strong>.
\r\n\u2716 High concentrations can damage or kill St. Augustine grass<\/strong>, causing yellowing, stunted growth, or even turf dieback<\/strong>.
\r\n\u2716 Stress factors<\/strong> such as heat, drought, or over-application<\/strong> increase the risk of grass injury.<\/p>\r\n

When Can 2,4-D Kill or Harm St. Augustine Grass?<\/strong><\/h3>\r\n