For homeowners managing St. Augustine grass, choosing the right weed control combined with fertilizer is essential to keep lawns lush and weed-free. This guide compares five top liquid and granular weed-and-feed products that are suitable for St. Augustine lawns, focusing on active ingredients, application methods, and weed coverage. Each product is evaluated on how effectively it targets common broadleaf weeds while delivering essential nutrients to support steady growth. The goal is to help you select a reliable option that fits your lawn’s needs and your preferred application style.
| Product | Brand | Type | Key Weeds & Features |
|---|---|---|---|
| Scotts Liquid Turf Builder with Plus 2 Weed Control (32 fl. oz.) | Scotts | Liquid Weed Killer & Fertilizer | Kills listed weeds while boosting nitrogen; controls dandelion, clover, ground ivy, henbit, chickweed, plantain, poison ivy, and more; ready-to-spray |
| Fertilome St. Augustine Weed & Feed 15-0-4 (12.8 lbs.) | ferti-lome | Granular Weed & Feed | Pre-emergent and post-emergent weed control plus fertilizer; designed for St. Augustine lawns; avoid Bermuda and some Northern grasses |
| Sunniland Weed & Feed 20-0-6 Lawn Fertilizer (5000 sq. ft.) | Generic | Granular Weed & Feed | Easy to spread; two applications per year; works on all types of St. Augustine grass |
| BioAdvanced 3-in-1 Weed and Feed for Southern Lawns (10 lb) | BioAdvanced | Granular Weed & Feed | Formulated for Southern lawns including Floratam; up to 6 months of weed prevention; kills listed broadleaf weeds |
| Spectracide Weed & Feed 20-0-0 (Ready-to-Spray) (32 fl oz) | Spectracide | Liquid Weed & Feed | Dual-action formula kills major broadleaf weeds while feeding lawn; targets dandelion, chickweed, clover, and more |
Selecting a product for St. Augustine grass involves understanding the growth cycle of your lawn, the types of weeds you encounter, and how you prefer to apply treatment. The following sections break down each product’s strengths, typical application scenarios, and considerations to help you make an informed choice. Note that product availability, formulations, and labels can change, so always verify current instructions on the product page before use.
Scotts Liquid Turf Builder With Plus 2 Weed Control
Product overview: Scotts Liquid Turf Builder with Plus 2 Weed Control is a liquid concentrate designed to be applied via spray. It combines essential nitrogen with a weed control component that targets a broad spectrum of listed weeds. The ready-to-spray formula offers quick uptake by actively growing weeds, making it a practical option for rapid weed suppression while feeding your lawn. The product is commonly favored for lawns that require a fast-acting solution and a straightforward spray method.
Key features and performance: The product provides nitrogen boost for lawn color and vigor and includes a weed-killing component designed to target common broadleaf weeds like dandelion, clover, sedges, and other listed species. Application timing typically aligns with weed growth spurts in spring and early summer. For St. Augustine lawns, ensure you follow labeled adjustments for warmer-season grasses and avoid application during extreme heat to minimize leaf burn. Consistent use can help manage weed pressure while maintaining lawn health.
Application considerations: The liquid format allows uniform coverage when used with a sprayer. Lightweight mixing and quick absorption can yield visible improvements within days. Always read the label for rate guidance, especially for large lawns, and avoid mowing immediately before or after application. It’s important to avoid applying to stressed or drought-affected turf, and to water the lawn as directed after treatment if required by the label.
Fertilome St. Augustine Weed & Feed 15-0-4
Product overview: Fertilome St. Augustine Weed & Feed combines a fertilizer with weed control tailored to St. Augustine lawns. The formulation is designed to provide a balanced N-P-K mix (15-0-4) to support turf growth while addressing common weeds. This product is positioned for lawns that require both weed suppression and nutrient replenishment, particularly in regions where St. Augustine is prevalent.
Key features and performance: The product emphasizes pre-emergent and post-emergent weed control, aiming to curb weed establishment and suppress existing broadleaf species. It is specifically noted for St. Augustine and related grass types, helping to minimize the risk of applying too broad a spectrum that could affect sensitive varieties. Be mindful of regional restrictions and grass type compatibility, as the label advises against use on Bermuda and some Northern grasses.
Application considerations: Follow label directions for spread rate and timing. Granular products often require watering-in after application to activate the weed control components and to begin nutrient release. For best results, apply during periods of active weed growth and when temperatures are conducive to fertilizer uptake. Avoid applying to stressed turf or when rainfall is forecast to exceed label recommendations, as overflow can lead to runoff and uneven distribution.
Sunniland Weed & Feed 20-0-6 Lawn Fertilizer
Product overview: Sunniland Weed & Feed offers a granular approach suitable for St. Augustine lawns, combining weed control with a 20-0-6 fertilizer ratio. The product is described as easy to spread and handle, with two applications recommended in spring and fall. It is marketed as compatible with all types of St. Augustine grasses, making it a versatile option for multi-season maintenance.
Key features and performance: The inclusion of weed control alongside a balanced fertilizer helps strengthen turf while reducing weed encroachment. The higher potassium level (the 6) can contribute to improved turf stress tolerance and overall lawn resilience during hot, humid conditions common in many St. Augustine regions.
Application considerations: Granular applications typically require even spreading and water in to activate the product. This can be particularly convenient for homeowners who prefer less frequent treatments compared to liquid sprays. As with any fertilizer, avoid applying during extreme heat or drought; schedule applications when the lawn can recover with adequate soil moisture.
BioAdvanced 3-in-1 Weed and Feed for Southern Lawns
Product overview: BioAdvanced 3-in-1 Weed and Feed is designed for Southern lawns, including Floratam St. Augustine. It combines weed-killing action with a lawn fertilizer. The product aims to provide protection against weeds for up to 6 months while feeding the turf to maintain vigor during the growing season.
Key features and performance: The formulation targets listed broadleaf and grassy weeds commonly encountered in Southern climates, providing a weed-prevention component that can reduce future weed emergence. It is specifically marketed for St. Augustinegrass varieties, including Floratam, making it a fitting option for many Southern landscapes.
Application considerations: Follow application rates and timing based on the label. The product is typically applied as a granular spread and requires watering in as directed. Consider weather patterns and seasonal weed pressure to maximize effectiveness, and avoid applying to dormant or stressed turf to prevent potential damage.
Spectracide Weed & Feed 20-0-0 Ready-to-Spray
Product overview: Spectracide Weed & Feed combines a ready-to-spray weed killer with a 20-0-0 nitrogen-rich fertilizer. This liquid formulation is designed to target a broad range of common lawn weeds while simultaneously feeding the turf, simplifying lawn care by merging two tasks into one application.
Key features and performance: The dual-action formula supports weed control and lawn nourishment, with emphasis on broadleaf weed suppression. The product is suitable for St. Augustine lawns that tolerate higher nitrogen inputs and can benefit from quick, visible weed control alongside greening effects.
Application considerations: As a ready-to-spray product, uniform coverage is essential. Follow label guidance for mixing (or ready-to-use application) and ensure proper nozzle settings for even distribution. Avoid applying during periods of drought or extreme heat, and adhere to any local guidelines about fertilizer use and runoff.
Scotts Liquid Turf Builder With Plus 2 Weed Control (2-Pack)
Product overview: This is a two-pack option for Scotts Liquid Turf Builder with Plus 2 Weed Control, designed to deliver liquid weed control combined with lawn fertilizer. The 2-pack provides extended coverage and convenience for larger lawns or for those who want a backup supply.
Key features and performance: The formulation emphasizes rapid fertilization within 24 hours and robust weed control, including dandelions, clover, and other listed weeds. The dual action is intended to offer both immediate weed suppression and longer-term lawn nutrition, which can be appealing for maintenance programs with regular schedules.
Application considerations: Treat on actively growing weeds for best results. Ensure proper dilution and spraying techniques, and monitor soil conditions to avoid potential foliar burn. As with single bottles, avoid mowing immediately before or after application if possible, and follow all label directions for safe use on St. Augustine lawns.
Bonide Liquid Weed & Feed 32 oz
Product overview: Bonide Liquid Weed & Feed is a ready-to-spray weed control product that also delivers a 20-0-0 nitrogen-based fertilizer. It is designed for outdoor lawn and garden use and aims to simplify lawn care by combining weed management with fertilization in a single bottle.
Key features and performance: The product addresses a broad range of weeds, including common broadleaf species, while providing nitrogen to support lawn vigor. It is described as suitable for St. Augustinegrass and other warm-season grasses, but always check local recommendations and label directions for your region.
Application considerations: Follow label instructions for dilution and spray patterns. Liquid applications require careful coverage to avoid patchy results. Watering in may be recommended by the label, and avoid applying during peak heat or drought conditions to protect the lawn’s health.
Buying Guide: Key Considerations for Choosing a Weed And Feed For St Augustine
When selecting a weed-and-feed product for St. Augustine grass, consider the following factors to ensure optimal results and lawn safety.
- Weed spectrum – Identify the most common weeds in your yard (dandelion, clover, chickweed, dollarweed, etc.). Some formulas are designed to target broadleaf weeds, while others include grassy weed control. Read the label to confirm coverage.
- Formulation – Liquid formulas offer rapid action and even coverage, especially for large areas, but may require more frequent applications. Granular products often provide slower release and longer-lasting results with less frequent applications, suitable for weekend maintenance.
- Grass compatibility – Ensure the product is labeled for St. Augustine grass (and varieties like Floratam). Some products are not recommended for certain southern grasses or for Bermuda and northern grasses.
- Seasonality – Align applications with weed growth cycles and the lawn’s active growing season. Southern climates may allow multiple applications per year, while other regions require more careful timing.
- Watering and activation – Granular products typically need watering, while liquids may require adequate moisture for uptake. Follow label instructions on post-application watering or drying times.
- Safety and environmental considerations – Respect local regulations on fertilizer use and runoff. Avoid applying during drought, extreme heat, or on stressed turf to prevent damage and ensure optimal weed control results.
- Label instructions always come first. Read the product label thoroughly before application, including any restrictions for St. Augustine grasses.
- Application timing matters. Apply when weeds are actively growing and the lawn is healthy. Avoid applying during periods of heat stress or drought.
- Spray and spread techniques must be precise. For liquids, use a compatible sprayer and maintain even coverage; for granules, use a broadcast spreader with an appropriate setting.
- Environmental impact consider local guidelines about fertilizer use, irrigation restrictions, and runoff risk to protect water quality and nearby landscaping.
- Maintenance plan – Weed control is most effective when integrated into a broader lawn-care routine, including proper mowing height, irrigation, and seasonal fertilization.